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Backflow Preventer

backflow prevnetion to stop basement drain backups

 

backflow preventers prevent basement drains from backing up

backflow valves economically stop basement flooding - price check


When water flows through a pipe in the reverse direction that the system designer intended, it's call a "backflow".

Typically, the term "backflow preventer" has been used to stop backflow in a fresh water system caused by siphoning.

Recently, many people have started to use the terms backflow preventer, backflow valve and backwater valve interchangeably so it may be confusing to see the backflow based terms used to describe sewage backflow prevention.

At any rate, an automated gate within a valve designed to keep an unwanted reverse flow out may be correctly be called a "Backwater Valve", "Backflow Valve" or "Backflow Preventer"

Simply put, a  backwater valve, backflow valve or backflow preventer automatically senses a reverse flow (either water or sewage flowing the wrong direction)  in a pipe and completely closes the line when the condition occurs.

Our Mainline 4963 Backwater Valve installed in the main line below your basement floor is one of the most economical and effective ways to prevent sewage or storm water from backing up in drains or plumbing fixtures in the lowest level of your home.


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Adapt-A-Valves

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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

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Back water valve questions

Frequently Asked Questions

adobe acrobat pdf filesFullport Backwater Valve Brochure (Adobe Acrobat pdf)

how to install your backwater valveINSTALLATION TIPS;  how to install backwater valves 

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

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

6" Backwater Valves - Mainline STRAIGHT FIT Backwater Valves

Mainline History

backwater valve measurements and specificationsMeasurements, Specifications and IAPMO Certifications

Pedestal Sump Pumps / Submersible Sump Pumps -

Testimonials

Mainline Fullport Backwater Valves offer the right solution for your sewer backup problems. SPECIAL OFFER: Mainline Backwater Valve "Combo" with Access Box ($89.00 value if purchased separately) Valves without Access Box are also available with a slight shipping discount in the price.

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

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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)

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