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INSTALLATION TIPS; how to install backwater valves
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6" Backwater Valves - Mainline STRAIGHT FIT Backwater Valves
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Measurements, Specifications and IAPMO Certifications
Frequently Asked Questions
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
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)
Check Our FREQUENTLY ASKED QUESTIONS Page
© 2004-2015 Backwater-Valves.com.
Akron, OH, USA
All rights reserved.
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.
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.
New Straight-Fit and ML-FR4 require less slope.
(refer to detail pages for these products)
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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