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 ABS or PVC plastic 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" (sometimes referred as a "Backflow Preventer") in the main line to the sewer, property owners reduce their exposure to such an incident to almost nothing.
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.
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.
Adapt-A-Valve Brochure (Adobe Acrobat pdf)
Adapt-A-Valve Inspection Chamber
Backwater Valve Diagram
Fullport Backwater Valve Brochure (Adobe Acrobat pdf)
INSTALLATION TIPS; how to install backwater valves
Termex Backwater Valves
NEW: TOP-CHECK BACKWATER VALVES
Mainline ML-FR4 Backwater Valve (Fio Valve)
6" Backwater Valves - Mainline STRAIGHT FIT Backwater Valves
Measurements, Specifications and IAPMO Certifications
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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.
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)
Mainline Valve Warranty
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