Backflow Preventer

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.

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

- INSTALLATION TIPS -

- Fullport Backwater Valve Brochure (Adobe Acrobat pdf) --- Adapt-A-Valve Brochure (Adpbe Acrobat pdf) -

- Adapt-A-Valves -
- NEW Adapt-A-Valve Inspection Chamber -
- Basement Drain Backing Up - Mainline History - Testimonials - Home -

- Affordable Flood Alarms - Pedestal Sump Pumps / Submersible Sump Pumps -

Measurements and Specifications
Frequently Asked Questions
Contact Us

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

All Orders must be placed online by Credit Card,
but you may phone Greg at 330.836.9393 for info
(9 AM - 4 PM EST Monday - Friday or Voicemail anytime)
Email: Help@Backwater-Valves.com
Check Our FREQUENTLY ASKED QUESTIONS Page

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

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

High-volume inquires are directed to Tom at Mainline

Backwater-valves.com / Bike-run-walk.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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