Classification: Type I – intended for use in horizontal pipe runs to floor drains, building drains, sewers, holding tanks, etc.
Application: Backwater valves should be used in building drainage systems whenever a risk of flooding due to sewer surcharge, back up, or failure exists.
Backwater valves must be installed to ensure access for inspection or maintenance.
Component: Body, Lid, Gate, Cleanout plug Acrylonitrile-Butadiene-Styrene ( ABS ) Plastic
Bolting System: Bolts - Stainless steel ¼ x ¾, Nuts - ¼ stainless steel
Gate Seal: Neoprene rubber ( Buna 50 durometer #241 )
Lid Gasket: Flat-section closed-cell gasket Neoprene 3/16 x 3/8 ( 1220 RL BL x 1 )
Floatation Devices: Closed-cell cross-linked polyethylene ( PEX ) foam “Boltaron Polyethylene”
Dimensions: Width: 10" (254 mm), Length: 15.5" (394 mm), Height: 11" ( 280 mm )
Certifications & Approvals:
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
Mainline Fullport Backwater Valves offer the right solution for your sewer backup problems.
Protect Your Home with a Backwater Valve
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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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