Backwater Valves; presenting the new, innovative product designed to more economically solve flooded basement and sewer backup problems.

Raw sewage in your basement. Can you imagine it spewing out of your toilets, shower stalls and sinks? With record high precipitation in many parts of the nation, some families have experienced such unfortunate events. These backups not only cause damage that is difficult to repair, but also create dangerous health hazards. A floor drain backwater valve or mainline backwater valve can save the day. These check valves are also sometimes referred to as "backflow prevention valves" or "backflow preventer valves".

While cities and municipalities work relentlessly to clean and inspect sewer main lines, it is still possible for a sewer main to plug up and allow water and sewage to flow into the dwellings it serves. But help is here! By installing the award winning "Mainline Fullport Backwater Valve" in the main line to the sewer, property owners reduce their exposure to such an incident to almost nothing.

positioning and placement of a sewer line backflow prevention valves Who's at risk? Your home or building may be susceptible to sewage backups if the lowest drain is less than 24" above the nearest upstream manhole. Most building codes require owners to install a backflow prevention valve to minimize the chance of flooding at properties with drains that meet the specification mentioned above.

backflow prevention valves How does it work? A backwater valve can be installed in the basement at the exit point from the home or building, or in the sewer lateral outside of the building.

The "lateral" is the underground pipe that carries sewage from private property to the city’s sewer main. The backflow valve is installed downstream and prevents sewage from backing up into the lateral beyond ("above") this valve.

access box for backflow valves
Access Box -
Model PE2013

( SPECIAL OFFER: Access Box free of charge with the purchase of a 4963 ABS or PVC Backwater valve - a $50 value )

When installing in a lateral, the backwater valve is place in an access box to make maintenance easy.

Backflow prevention valves (and all safety check valves for that matter) should be inspected on an annual basis. With our award-winning design, patented backflow valve, you can simply look through the clear plastic lid for easy visual inspection and remove the screw-off cap to clean out any debris!

Note: This type of check valve should not be confused with and does not replace the sewer trap that prevents sewer gas from entering a building where it is installed.

clear top of back water valve body
New Clear Top valve design
for easy visual inspection
(black ABS valve shown)

NEW: We are now carrying Mainline "Adapt-A-Valves" (shown at left "extended" with DWV from your local home center or supply house) in 3" and 4" PVC and ABS.

These valves are designed for indoor or outdoor use, but they are most economical when an in-the-ground installation is required because you don't need to pay for a costly vault to provide access. (The mainline fullport backflow valve above is better for indoor use because you can visually see a problem with the clear top, but there are some indoor applications where an adapta-valve makes sense too.)

The gate is designed a a removable cassette and is removed though a standard cap with a simple cut-to-length handle made from common 3/4" PVC pipe and a 3/4" PVC tee!

- 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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High-volume inquires may be directed to Tom at Mainline

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