Backwater Valves

NEW Top Check Backwater Valves and Top Check Backwater Valve parts
ALWAYS check your local building code before installing. contact us	ML PVC4TCCombo - Mainline Top-Check Backwater Valve with Manual Close feature for use with 4" Schedule 40 PVC drainage pipe: THIS IS A SPECIAL COMBO PACKAGE These valves are typically installed inside in the basement floor for easy access. To assist in allowing the installation to be flush with the basement floor level, it is shipped with a Mainline ABS Access Box! To reduce the possibility of groundwater, radon gas, bugs and insects and to help with nice clean valve access free of gravel, sand, mud and water, it is shipped with a Mainline Bladder Seal! To aid you in knowing when your Top Check is closed and protecting you from a backflow event, it is shipped with a Mainline Top-Check Alarm!. NOTE: If you do not have inside access (as in buildings built on a slab), you may want to look at our Adapt-A-Valves or Straight Fit Valves (see sections below). Click for details about this new item Please make sure you want 4 inch PVC Schedule 40 DWV Topcheck Backwater Valve when you select this part number. Shipping Options at bottom of page and will be offered at checkout
		$ 510.00

ALWAYS check your local building code before installing. contact us	TOP CHECK VALVE ONLY ML PVC4TC - Mainline Top-Check Backwater Valve with Manual Close feature for use with 4" Schedule 40 PVC drainage pipe: Same as above, but valve only Please make sure you want 4 inch PVC Schedule 40 DWV Topcheck Backwater Valve when you select this part number. Shipping Options at bottom of page and will be offered at checkout
		$ 345.00

contact us	TOP CHECK ALARM KIT ML TCAlarm - Mainline Top-Check Backwater Valve ALARM KIT for use only with Mainline brand Top Check Backwater Valves: Please make sure you have a Mainline brand TOP CHECK Backwater Valve when you select this part number or this product may not work with your valve. Shipping Options at bottom of page and will be offered at checkout
		$ 169.00

contact us	TOP CHECK CONVERSION KIT Top Check Retrofit Kit Installation Instructions (Adobe Acrobat ) ML TCKit - Mainline Top-Check CONVERSION KIT - - - Contains all of the parts needed to RETROFIT an older Mainline brand 4963 FULLPORT Backwater Valve into a Top Check functioning model. Top Check Alarm Kit above can then also be used! Please make sure you have a Mainline brand 4963 FULLPORT Backwater Valve when you select this part number or this product will not work with your valve. Shipping Options at bottom of page and will be offered at checkout
		$ 149.00

contact us	TOP CHECK REPLACEMENT LID ML TCLid - Mainline Top-Check Backwater Valve REPLACEMENT Clear Lid - - - you must already have an original Top Check valve with the Top Check "innards" already in place. Please make sure you have a Mainline brand Top Check Valve when you select this replacement part number or this product will not work with your valve. Shipping Options at bottom of page and will be offered at checkout
		$ 69.00

		TC RK - New Stainless Steel Bolts (save original nuts), Foam Replacement Gasket and Neoprene O-ring that seats in valve body and seals the gate for Top Check Valves. Kit may be needed if you remove the clear plastic lid from valve for maintenance or to replace the gate or lid. Carefully clean all surfaces and install the new parts. $ 29.00
		TC Cap - New Cap for Top Check valves. Caps rarely need to be replaced, but we keep them in stock just in case. Comes WITH replacement O Ring $ 19.00
		Bladder Seal only - Bladder Seal only (Access Box NOT included) $ 24.00

Older Fullport Backwater Valves

Model 4963 Mainline Fullport Backwater Valves - for use with 4" Schedule 40 drainage pipe

These valves are typically installed inside in the basement floor for easy access. If you need your installation to be flush with the basement floor level, it is recommended that you install this valve in an Access Box (available below).

If you do not have inside access (as in buildings built on a slab), you may want to look at our Adapt-A-Valves or Straight Fit Valves (see sections below).

US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally.

Please make sure you want
4" ABS (Schedule 40 DWV) when you select this part #

4" ABS Backwater Valve
- WITH Access Box

now $340.00

. . . .

Please make sure you want
4" ABS (Schedule 40 DWV) when you select this part #

4" ABS Backwater Valve
WITHOUT Access Box

now $290.00

ALWAYS check your local building code before installing.- Shipping Options at bottom of page and will be offered at checkout - contact us

Replacement Parts for 4963 Fullport Backwater Valves

Model 4963 Mainline Fullport Backwater Valve Parts - for use with BOTH ABS & PVC Backwater Valves

		Replacement Lid with Cap - for 4963 Backwater Valve Clear Lid with 4" Cleanout Cap and O-Ring Seal for both 4" ABS and 4" PVC Backwater Valves. $ 55.00
		4963 RK - New Stainless Steel Bolts (save original nuts), Foam Replacement Gasket and Neoprene O-ring that seats in valve body and seals the gate for both 4" ABS and 4" PVC Backwater Valves. Kit may be needed if you remove the clear plastic lid from valve for maintenance or to replace the gate or lid. Carefully clean all surfaces and install the new parts. $ 29.00
		4963 Gate -New Gate for for both 4" ABS and 4" PVC valves. These Gates rarely need to be replaced, but we keep them in stock just in case. NOTE: The Clear Plastic Lid must be removed to replace Gate as it is larger than the 4" cleanout access. Gate simply snaps in place in channels inside of the valve body. $ 25.00
		4963 Cap -New Gate for for both 4" ABS and 4" PVC valves. Caps rarely need to be replaced, but we keep them in stock just in case. Comes WITH replacement O Ring $ 19.00

ALWAYS check your local building code before installing.- Shipping Options at bottom of page and will be offered at checkout - contact us

ML-FR4 Backwater Valve with Access Box Combo (old "Fio Valve")
ALWAYS check your local building code before installing. contact us	ML-FR4-A-Combo - Mainline (available only in Scheduel 40 ABS) for use with 4" ABS drainage pipe -- Normally OPEN Float-Ball Controlled Gate with clear plastic inspection lid assembly and SHIPPED WITH PE-2013 ACCESS BOX at bundled price!! These valves are typically installed inside in the basement floor for easy access. If you need your installation to be flush with the basement floor level, it is recommended that you install this valve in an Access Box (available below). If you do not have inside access (as in buildings built on a slab), you may want to look at our Adapt-A-Valves or Straight Fit Valves (see sections below). Click for more pictures and details about this new item Please make sure you want 4" ABS (Schedule 40 DWV) SHIPPED WITH the PE- 2013 ACCESS BOX when you select this part number. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 449.00

ML-FR4 Backwater Valve (old "Fio Valve")
ALWAYS check your local building code before installing. contact us	ML-FR4-A - Mainline (available only in Schedule 40 ABS) for use with 4" ABS drainage pipe -- Normally OPEN Float-Ball Controlled Gate with clear plastic inspection lid assembly Click for more pictures and details about this new item Please make sure you want 4" ABS (Schedule 40 DWV) when you select this part number. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 349.00

Adapt-A-Valves

ALWAYS check your local
building code before installing.

ML4XABS - Mainline Adapt-A-Valves are sold with removable NORMALLY OPEN cassette included in the price and for use with
4" ABS drainage pipe.

Designed for exterior in-the-ground use without a vault. Removable gate cassette allows gate to be easily removed for cleaning, or if drain line requires snaking.

Standard 6" DWV pipe and cap (not included) is cut to length to extend valve access to ground level at time of installation. At the same time, a piece of 3/4" PVC pipe is cut to length and glued to the removable gate on one end and tee on the other. This unique Adapt a Valve design allows for deep burial access in your yard without the need for a manhole or expensive underground vault.

Please make sure you want 4" ABS (Schedule 40 DWV) NORMALLY OPEN when you select this valve. ALWAYS check your local building code before installing.

Adapt A Valve does not require a vault !!

$ 199.00

4" ABS Adapta Valve

ALWAYS check your local
building code before installing.

ML4XABS - Mainline Adapt-A-Valves are sold with removable NORMALLY CLOSED cassette included in the price and for use with
4" ABS drainage pipe.

Designed for exterior in-the-ground use without a vault. Removable gate cassette allows gate to be easily removed for cleaning, or if drain line requires snaking.

Please make sure you want 4" ABS (Schedule 40 DWV) NORMALLY CLOSED when you select this valve. ALWAYS check your local building code before installing.

Adapt A Valve does not require a vault !!

$ 199.00

Adapta Valve

ALWAYS check your local
building code before installing.

ML4XPVC - Mainline Adapt-A-Valves are sold with removable NORMALLY OPEN cassette included in the price and for use with
4" PVC drainage pipe.

Designed for exterior in-the-ground use without a vault. Removable gate cassette allows gate to be easily removed for cleaning, or if drain line requires snaking.

Please make sure you want 4" PVC (Schedule 40 DWV) NORMALLY OPEN when you select this valve. ALWAYS check your local building code before installing.

Adapt A Valve does not require a vault !!

$ 199.00

Adapta Valve

ALWAYS check your local
building code before installing.

ML4XPVC - Mainline Adapt-A-Valves are sold with removable NORMALLY CLOSED cassette included in the price and for use with 4" PVC drainage pipe.

Designed for exterior in-the-ground use without a vault. Removable gate cassette allows gate to be easily removed for cleaning, or if drain line requires snaking.

Please make sure you want 4" PVC (Schedule 40 DWV) NORMALLY CLOSED when you select this valve. ALWAYS check your local building code before installing.

$ 199.00

Adapt a valve

ALWAYS check your local
building code before installing.

US, US Express, UK, Canada & Spain Shipping Options at bottom of page and will be offered at checkout

ML3XABS - Mainline Adapt-A-Valves are sold with removable NORMALLY OPEN cassette included in the price and for use with 3" ABS drainage pipe.

Designed for exterior in-the-ground use without a vault. Removable gate cassette allows gate to be easily removed for cleaning, or if drain line requires snaking.

Standard 4" DWV pipe and cap (not included) is cut to length to extend valve access to ground level at time of installation. At the same time, a piece of 3/4" PVC pipe is cut to length and glued to the removable gate on one end and tee on the other. This unique Adapt a Valve design allows for deep burial access in your yard without the need for a manhole or expensive underground vault.

Please make sure you want 3" ABS (Schedule 40 DWV) NORMALLY OPEN when you select this valve.

Adapt A Valve does not require a vault !!

$ 179.00

Adaptavalve

ALWAYS check your local
building code before installing.

US, US Express, UK, Canada & Spain Shipping Options at bottom of page and will be offered at checkout

ML3XPVC - Mainline Adapt-A-Valves are sold with removable NORMALLY OPEN cassette included in the price and for use with 3" PVC drainage pipe.

Designed for exterior in-the-ground use without a vault. Removable gate cassette allows gate to be easily removed for cleaning, or if drain line requires snaking.

Please make sure you want 3" PVC (Schedule 40 DWV) NORMALLY OPEN when you select this valve.

Adapt-A-Valve does not require a vault !!

$ 179.00

Straight Fit Extendable Backwater Valves


ALWAYS check your local building code before installing. contact us	MLSF668PNC - STRAIGHT FIT PVC (available in PVC Only) Mainline Straight-Fit Extendable Backwater Valve For use with 6" Schedule 40 PVC drainage pipe Shipped WITHOUT ACCESS BOX: (PVC Valve Body and Standard Normally-Closed Gate). 6" STRAIGHT FIT Valves drop less than 1/2" from inlet to outlet over 12" of run 6" STRAIGHT-FIT^TM backwater valves have a body that is extendable to whatever depth you require by simply gluing a riser of 8" Schedule 40 (like material) pipe into the valve body and extending it to ground level. This sourced on site and cut-to-size on site riser is to be capped with an air-tight cap. The normally closed gate is glued to a piece of ¾” PVC pipe (sourced on site and cut on site to proper length) and terminated with a 3/4" Schedule 40 PVC tee to form a tool to extract the gate from the valve body. Mainline has integrated Smart-CURVE^TM technology into these valves where the curved gate and Smart-CURVE^TM "cleat insert" are designed to allow a sewer rodding snake to feed and retract without catching on the gate or valve body. The STRAIGHT-FIT^TM also features an optional Test Gate that can be used to pressure test the system or to isolate the property for whatever purpose; non -payment of services, vacation properties, servicing etc. Patented USA 4503881 and Canada 1196835; other patents pending. ASME A112.14.1-03, CSA B181.1-02 and B181.2-02, UPC US 8.096.318 and Canada 7.757.706 and 2.414.634. Please make sure you want 6" PVC Schedule 40 DWV) when you select this part number. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 330.00

ALWAYS check your local building code before installing. contact us	MLSF446ANC - STRAIGHT FIT ABS - Mainline Straight-Fit Extendable Backwater Valve For use with 4" Schedule 40 ABS drainage pipe Shipped WITHOUT ACCESS BOX: (ABS Valve Body and Standard Normally-Closed Gate) 4" STRAIGHT FIT Valves drop less than 1/2" from inlet to outlet over 8" of run 4" STRAIGHT-FIT^TM backwater valves have a body that is extendable to whatever depth you require by simply gluing a riser of 6" Schedule 40 (like material) pipe into the valve body and extending it to ground level. This sourced on site and cut-to-size on site riser is to be capped with an air-tight cap. The normally closed gate is glued to a piece of ¾” PVC pipe (sourced on site and cut on site to proper length) and terminated with a 3/4" Schedule 40 PVC tee to form a tool to extract the gate from the valve body. Mainline has integrated Smart-CURVE^TM technology into these valves where the curved gate and Smart-CURVE^TM "cleat insert" are designed to allow a sewer rodding snake to feed and retract without catching on the gate or valve body. The STRAIGHT-FIT^TM also features an optional Test Gate that can be used to pressure test the system or to isolate the property for whatever purpose; non -payment of services, vacation properties, servicing etc. Patented USA 4503881 and Canada 1196835; other patents pending. ASME A112.14.1-03, CSA B181.1-02 and B181.2-02, UPC US 8.096.318 and Canada 7.757.706 and 2.414.634. Please make sure you want 4" ABS (Schedule 40 DWV) when you select this part number. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 195.00

ALWAYS check your local building code before installing. contact us	MLSF446PNC - STRAIGHT FIT PVC - Mainline Straight-Fit Extendable Backwater Valve For use with 4" Schedule 40 PVC drainage pipe Shipped WITHOUT ACCESS BOX: (PVC Valve Body and Standard Normally-Closed Gate). 4" STRAIGHT FIT Valves drop less than 1/2" from inlet to outlet over 12" of run 4" STRAIGHT-FIT^TM backwater valves have a body that is extendable to whatever depth you require by simply gluing a riser of 6" Schedule 40 (like material) pipe into the valve body and extending it to ground level. This sourced on site and cut-to-size on site riser is to be capped with an air-tight cap. The normally closed gate is glued to a piece of ¾” PVC pipe (sourced on site and cut on site to proper length) and terminated with a 3/4" Schedule 40 PVC tee to form a tool to extract the gate from the valve body. Mainline has integrated Smart-CURVE^TM technology into these valves where the curved gate and Smart-CURVE^TM "cleat insert" are designed to allow a sewer rodding snake to feed and retract without catching on the gate or valve body. The STRAIGHT-FIT^TM also features an optional Test Gate that can be used to pressure test the system or to isolate the property for whatever purpose; non -payment of services, vacation properties, servicing etc. Patented USA 4503881 and Canada 1196835; other patents pending. ASME A112.14.1-03, CSA B181.1-02 and B181.2-02, UPC US 8.096.318 and Canada 7.757.706 and 2.414.634. Please make sure you want 4" PVC Schedule 40 DWV) when you select this part number. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 195.00

ALWAYS check your local building code before installing. contact us	MLSF334ANC - STRAIGHT FIT ABS - Mainline Straight-Fit Extendable Backwater Valve For use with 3" Schedule 40 ABS drainage pipe Shipped WITHOUT ACCESS BOX: (ABS Valve Body and Standard Normally-Closed Gate) 3" STRAIGHT FIT Valves drop less than 3/8" from inlet to outlet over 7" of run 3" STRAIGHT-FIT^TM backwater valves have a body that is extendable to whatever depth you require by simply gluing a riser of 4" Schedule 40 (like material) pipe into the valve body and extending it to ground level. This sourced on site and cut-to-size on site riser is to be capped with an air-tight cap. The normally closed gate is glued to a piece of ¾” PVC pipe (sourced on site and cut on site to proper length) and terminated with a 3/4" Schedule 40 PVC tee to form a tool to extract the gate from the valve body. Mainline has integrated Smart-CURVE^TM technology into these valves where the curved gate and Smart-CURVE^TM "cleat insert" are designed to allow a sewer rodding snake to feed and retract without catching on the gate or valve body. The STRAIGHT-FIT^TM also features an optional Test Gate that can be used to pressure test the system or to isolate the property for whatever purpose; non -payment of services, vacation properties, servicing etc. Patented USA 8.096.318 / 7.757.406 and Canada 2.414.834; other patents pending. ASME A112.14.1-03, CSA B181.1-02 and B181.2-02, UPC US 8.096.318 and Canada 7.757.706 and 2.414.634. Please make sure you want 3" ABS (Schedule 40 DWV) when you select this part number. Shipping Options at bottom of page and will be offered at checkout
		$ 168.00

ALWAYS check your local building code before installing. contact us	MLSF33PNC - STRAIGHT FIT PVC - Mainline Straight-Fit Extendable Backwater Valve For use with 3" Schedule 40 PVC drainage pipe Shipped WITHOUT ACCESS BOX: (PVC Valve Body and Standard Normally-Closed Gate). 3" STRAIGHT FIT Valves drop less than 3/8" from inlet to outlet over 7" of run 3" STRAIGHT-FIT^TM backwater valves have a body that is extendable to whatever depth you require by simply gluing a riser of 4" Schedule 40 (like material) pipe into the valve body and extending it to ground level. This sourced on site and cut-to-size on site riser is to be capped with an air-tight cap. The normally closed gate is glued to a piece of ¾” PVC pipe (sourced on site and cut on site to proper length) and terminated with a 3/4" Schedule 40 PVC tee to form a tool to extract the gate from the valve body. Mainline has integrated Smart-CURVE^TM technology into these valves where the curved gate and Smart-CURVE^TM "cleat insert" are designed to allow a sewer rodding snake to feed and retract without catching on the gate or valve body. The STRAIGHT-FIT^TM also features an optional Test Gate that can be used to pressure test the system or to isolate the property for whatever purpose; non -payment of services, vacation properties, servicing etc. Patented USA 8.096.318 / 7.757.406 and Canada 2.414.834; other patents pending. ASME A112.14.1-03, CSA B181.1-02 and B181.2-02, UPC US 8.096.318 and Canada 7.757.706 and 2.414.634. Please make sure you want 3" PVC Schedule 40 DWV) when you select this part number. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 168.00

ALWAYS check your local building code before installing. contact us	MLSF336Gate - 3" Normally Closed Gate for 3" ABS or PVC STRAIGHT FIT Backwater Valves Original Normally Closed Replacement Gate for 3 inch Straight Fit Valve. Shipping Options at bottom of page and will be offered at checkout
		$ 35.00

ALWAYS check your local building code before installing. contact us	MLSF446Gate - 4" Normally Closed Gate for 4" ABS or PVC STRAIGHT FIT Backwater Valves Original Normally Closed Replacement Gate for 4 inch Straight Fit Valve. Shipping Options at bottom of page and will be offered at checkout
		$ 39.00

ALWAYS check your local building code before installing. contact us	MLSF668Gate - 6" Normally Closed Gate for 6" ABS or PVC STRAIGHT FIT Backwater Valves Original Normally Closed Replacement Gate for Straight Fit Valve. Shipping Options at bottom of page and will be offered at checkout
		$ 45.00

ALWAYS check your local building code before installing. contact us	MLSF334TestEze - 3" Test Gate for 3" ABS or PVC STRAIGHT FIT Backwater Valves The insertion of a Test-Eze Gate into your Straight Fit Valve allows for isolation of the Valve to manually stop flow into and out of the building for inspection, or for some of the following other reasons: flushing of city mains, servicing of sewer lines, abandonment of premises, isolation of seasonal properties, during storms / hurricanes, contractors pressure testing of plumbing systems upstream of the valve chamber / cleanout, etc. Shipping Options at bottom of page and will be offered at checkout
		$ 25.00

ALWAYS check your local building code before installing. contact us	MLSF446TestEze - 4" Test Gate for 4" ABS or PVC STRAIGHT FIT Backwater Valves The insertion of a Test-Eze Gate into your Straight Fit Valve allows for isolation of the Valve to manually stop flow into and out of the building for inspection, or for some of the following other reasons: flushing of city mains, servicing of sewer lines, abandonment of premises, isolation of seasonal properties, during storms / hurricanes, contractors pressure testing of plumbing systems upstream of the valve chamber / cleanout, etc. Shipping Options at bottom of page and will be offered at checkout
		$ 28.00

ALWAYS check your local building code before installing. contact us	MLSF668TestEze - 6" Test Gate for 6" ABS or PVC STRAIGHT FIT Backwater Valves The insertion of a Test-Eze Gate into your Straight Fit Valve allows for isolation of the Valve to manually stop flow into and out of the building for inspection, or for some of the following other reasons: flushing of city mains, servicing of sewer lines, abandonment of premises, isolation of seasonal properties, during storms / hurricanes, contractors pressure testing of plumbing systems upstream of the valve chamber / cleanout, etc. Shipping Options at bottom of page and will be offered at checkout
		$ 36.00

Termex Backwater Valves
ALWAYS check your local building code before installing. contact us	MLTRMXNC - Mainline 110mm PVC TERMEX Backwater Valve for use with 110mm PVC drainage pipe: SHIPPED WITH Normally CLOSED Gate Click for details about this new item Please make sure you want 110mm PVC (Schedule 40) when you select this part number - Uses "Fernco" brand Neoprene Adapter to connect. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 79.00

ALWAYS check your local building code before installing. contact us	MLTRMXNO - Mainline 110mm PVC TERMEX Backwater Valve for use with 110mm PVC drainage pipe. SHIPPED WITH Normally OPEN Gate Click for details about this new item Please make sure you want 110mm (Schedule 40) when you select this part number. Uses "Fernco" brand Neoprene Adapter to connect. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 79.00

Inspection Chambers
ALWAYS check your local building code before installing. contact us	ML88ICRNO - Mainline PVC Inspection Chamber (constructed to SDR 26 heavy wall sewer specification) for use with 4" PVC drainage pipe SHIPPED WITH Normally OPEN Gate and 8" Lid Assembly Click for details about this item Please make sure you want 4" SDR 35 when you select this part number. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 279.00

ALWAYS check your local building code before installing. contact us	ML88ICRNC - Mainline PVC Inspection Chamber (constructed to SDR 26 heavy wall sewer specification) for use with 4" PVC drainage pipe; SHIPPED WITH Normally CLOSED Gate and 8" Lid Assembly Click for details about this item Please make sure you want 4" PVC (Schedule 40 DWV) when you select this part number. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 279.00

Extra Adapt-A-Valves Cassettes
contact us	PA4CassNO - Extra NORMALLY OPEN Cassette for 4" ABS or PVC Adapt-A-Valve. Uses 4" special buoyant disk for flotation to lift gate into the closed position when a backflow condition occurs. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 45.00

contact us	PA4CassNC - Extra NORMALLY CLOSED Cassette for 4" ABS or PVC Adapt-A-Valve. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 45.00

contact us	PA3CassNO - Extra NORMALLY OPEN Cassette for 3" ABS or PVC Adapt-A-Valve. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 42.00

contact us	PA3CassNC - Extra NORMALLY CLOSED Cassette for 3" ABS or PVC Adapt-A-Valve. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 42.00

Adapt-A-Valves Eze Test Gate
contact us	PZ-4-TZ Test-Eze Gate - Solid Cassette acts as an Isolation Valve / Knife Valve for either 4" ABS or 4" PVC Adapt-A-Valve. The insertion of a Test-Eze Gate into your Adapt-A-Valve allows for isolation of the Adapt-A-Valve Chamber / Cleanout to manually stop flow into and out of the building for inspection, or for some of the following other reasons: flushing of city mains, servicing of sewer lines, abandonment of premises, isolation of seasonal properties, during storms / hurricanes, contractors pressure testing of plumbing systems upstream of the valve chamber / cleanout, etc. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 39.00

contact us	PZ-3-TZ Test-Eze Gate - Solid Cassette acts as an Isolation Valve / Knife Valve for either 3" ABS or 3" PVC Adapt-A-Valve. The insertion of a Test-Eze Gate into your Adapt-A-Valve allows for isolation of the Adapt-A-Valve Chamber / Cleanout to manually stop flow into and out of the building for inspection, or for some of the following other reasons: flushing of city mains, servicing of sewer lines, abandonment of premises, isolation of seasonal properties, during storms / hurricanes, contractors pressure testing of plumbing systems upstream of the valve chamber / cleanout, etc. US & Protectorates, US Express, All Canadian Provinces, Caribbean, UK, Western Europe, Scandinavia, Israel, Spain, South Africa, Australia, New Zealand. SPECIAL NOTE: You MUST be a "PayPal Verified" buyer for us to ship Internationally. Shipping Options at bottom of page and will be offered at checkout
		$ 35.00

Shipping Information

Shipping Options are presented at checkout:
--- We ship USPS or UPS Ground or Expedited Shipping Service in the United States.
--- Global Priority Mail Service to: Canada, UK, W. Europe, Scandinavia, Spain, Israel, S. Africa, Australia. New Zealand, Costa Rica, The Caribbean etc. with any additional duty charges for buyer's account.
----- SPECIAL NOTE: You MUST be a "PayPal Verified" Buyer for us to ship Internationally

eCheck Payments:
----- You MUST have a "PayPal Confirmed" Shipping Address for us to fulfill eCheck orders

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Adapt-A-Valves

Adapt-A-Valve Brochure (Adobe Acrobat pdf)

Adapt-A-Valve Inspection Chamber

Backwater Valve Diagram
Backwater Valve Features
Back water valves information
Backflow Links
Backflow Preventers
Backwater Valve Animation
Backwater Valve Videos

Basement Drain Backing Up

Flood Alarm

Frequently Asked Questions

Fullport Backwater Valve Brochure (Adobe Acrobat pdf)

INSTALLATION TIPS; how to install backwater valves

Termex Backwater Valves
Termex Backwater Valve Brochure (Adobe Acrobat pdf)

NEW: TOP-CHECK BACKWATER VALVES

Mainline ML-FR4 Backwater Valve (Fio Valve)
ML-FR4 Mainline Backwater Valve Fio Valve Brochure (Acrobat pdf)

6" Backwater Valves - Mainline STRAIGHT FIT Backwater Valves

Mainline History

Measurements, Specifications and IAPMO Certifications

Testimonials

Mainline Fullport Backwater Valves offer the right solution for your sewer backup problems.

Protect Your Home with a Backwater Valve
from Backwater-Valves.com

All Orders must be placed ONLINE by Credit Card

For non-order info, you may phone Greg at 330.836.9393 9 AM - 4 PM EST M-F
or Voicemail anytime)

Email: Help@Backwater-Valves.com

backwater-valves.com is independently owned and resells products produced and manufactured by Mainline of Canada and assumes no liability for the installation of backwater valves and related products.

Be sure to check with the plumbing authority in the municipality in which your valve is to be installed to insure that your installation is in compliance with local code, and be sure have your valve inspected by your local plumbing inspector after installation. Inspect your valve frequently; the Backwater Valve through its clear plastic housing top, and the Adapt-A-Valve, by removing the gate cassette.

IMPORTANT NOTES:

Pipe end-to-end, the Adapt-A-Valve takes up 6" of run in your line and the outlet is 1-1/2" LOWER than the inlet, so in just 6" the level of the pipe at the outlet side needs to be 1-1/2" lower.

Pipe end-to-end, the Backwater Valve takes up 12" of run in your line and the outlet is 3/4" LOWER than the inlet, so in just 12" the level of the pipe at the outlet side needs to be 3/4" lower.

Depending upon the amount of slope in your line (2% minimum is required for proper operation), you may need to replace several feet of pipe downstream from the valve to average out this "loss" of fall.

NOTE: New Straight-Fit and ML-FR4 require less slope. (refer to detail pages for these products)

Policies

Mainline Valve Warranty
(in printable Adobe Acrobat .pdf file)

Backwater-valves.com accepts these
major credit cards plus eCheck
using PayPal's secure checkout.
(No PayPal account needed)
We are unable to process phone orders,
all orders must be placed via the website.
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