Backwater Valves

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

4" ABS Backwater Valve
WITHOUT Access Box (1 left) $225

ALWAYS check your local building code before installing.- Shipping Options will be offered before checkout - contact us


ML-FR4 Backwater 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. Shipping Options will be offered before checkout.
		$279

Adapt-A-Valves

ALWAYS check your local
building code before installing.

Shipping Options will be offered before checkout.

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

4" ABS Adapta Valve

ALWAYS check your local
building code before installing.

Shipping Options will be offered before checkout.

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

Adapta Valve

ALWAYS check your local
building code before installing.

Shipping Options will be offered before checkout.

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

Adapta Valve

ALWAYS check your local
building code before installing.

Shipping Options will be offered before checkout.

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

Adapt a valve

ALWAYS check your local
building code before installing.

Shipping Options will be offered before 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 !!

$175

Adaptavalve

ALWAYS check your local
building code before installing.

Shipping Options will be offered before 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 !!

$175

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. Shipping Options will be offered before checkout.
		$289

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. Shipping Options will be offered before checkout.
		$199

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. Shipping Options will be offered before checkout.
		$199

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 will be offered before checkout.
		$175

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. Shipping Options will be offered before checkout.
		$175

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 will be offered before checkout.
		$39

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 will be offered before checkout.
		$45

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 will be offered before checkout.
		$49

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 will be offered before checkout.
		$29

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 will be offered before checkout.
		$35

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 will be offered before checkout.
		$39

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. Shipping Options will be offered before checkout.
		$75

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. Shipping Options will be offered before checkout.
		$75

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. Shipping Options will be offered before checkout.
		$259

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. Shipping Options will be offered before checkout.
		$259

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. Shipping Options will be offered before checkout.
		$46

contact us	PA4CassNC - Extra NORMALLY CLOSED Cassette for 4" ABS or PVC Adapt-A-Valve. Shipping Options will be offered before checkout.
		$46

contact us	PA3CassNO - Extra NORMALLY OPEN Cassette for 3" ABS or PVC Adapt-A-Valve. Shipping Options will be offered before checkout.
		$40

contact us	PA3CassNC - Extra NORMALLY CLOSED Cassette for 3" ABS or PVC Adapt-A-Valve. Shipping Options will be offered before checkout.
		$40

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. Shipping Options will be offered before checkout.
		$36

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. Shipping Options will be offered before checkout before checkout
		$30

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 non-US destinations are with any additional duty charges for buyer's account.
----- SPECIAL NOTE: You MUST be a "PayPal Verified" Buyer for us to ship Internationally

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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 will be offered before checkout
		$360

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 will be offered before checkout
		$169

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 be offered before checkout
		$159

contact us	TOP CHECK REPLACEMENT LID ML TCKit - Mainline Top-Check Backwater REPLACEMENT KIT - - - 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 will be offered before checkout
		$79

		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
		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 $25
		Bladder Seal only - Bladder Seal only (Access Box NOT included) $30

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