Backwater Valve Pricing

Our Mainline Combo Fullport Backwater Valves are available in ABS (pictured at right) and PVC and priced with and without Access Boxes*.

We also ship our Mainline Backwater Valves in combination with an Access Box at a reduced combo price (an $177.00 value).

Secure Online ordering

NOW AVAILABLE: Adapt-A-Valve Extendable Backwater Valves allow deep burial access in your yard with the need for manholes or expensive underground vaults. (Cap and 4" extension pipe for 3" valve or Cap and 6" extension pipe for 4" valve are not included, but available at any local home center or plumbing supply.)

Adapt-a-valve has several unique configuration features that allow it to be used in many money-saving ways.

Adapt A Valve is available in 3" PVC or ABS and 4" PVC or ABS.

normally-open or normally-closed

ML-3XA (3" ABS), ML-3XP (3" PVC), ML-4XA (4" ABS), ML-4XP (4" PVC)

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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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