ABS Backwater Valve PVC

Our award-winning, patented, Mainline fullport backwater valves have clear plastic tops so you can visually inspect for blockage BEFORE problems arise!

Model # PE 2013 Access Box
Model # PE 2013
Valve Access Box

Mainline Model # 4963 A (ABS) & Model # 4963 P (PVC) full port backwater valves.
Clear Top for easy visual inspection.
Fullport (normally open) non flow-restricting design. It's virtually self-cleaning!
No problems with Blockages.
Gate closes automatically when sewer starts to back up
Built in main sewer cleanout.
Cleaning rods do not destroy the gate when feeding or retrieving cleanout cables.
Normally open design allows the free circulation of air throughout the plumbing system to the municipal sewer system.
New, Award-Winning Technology.
Affordable building drain backup protection.
Backwater Valve US Patent # 5406972.

Cutaway view of our Model # 4963
main line full port back water valve

More detailed backwater valve specifications

- Back water valves - Backwater Valve Diagram - Backwater Valve Features -
- Backwater Valve Videos - Backflow Links - Backwater Valve Brochure (pdf) - Backwater Valve Animation -

- Adapt-A-Valves - Adapt-A-Valve Brochure (pdf) -
- Affordable Flood Alarms - Mainline History - Testimonials - Home -

Measurements and Specifications
Frequently Asked Questions
Contact Us

Mainline Fullport Backwater Valves offer the right solution for your sewer backup problems.
SPECIAL OFFER: We ship our Mainline Backwater Valves with Access Box ($85.00 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

Phone Greg at 330.836.9393
(9 AM - 4 PM Eastern 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 various manufacturers 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 5/8" LOWER than the inlet, so in just 12"
the level of the pipe at the outlet side needs to be 5/8" 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.

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