Mainline "IC"; the 4" Adapt-A-Valve Inspection Chamber
*The Adapt-A-Valve Inspection Chamber is based upon the proven Mainline Adapt-A-Valve cassette and receiver system which is now integrated into the Inspection Chamber.
With widespread record rainfall across the nation, and with widespread development that over-burdens the capacity of municipal sanitary sewer systems, basement flooding is occurring at record levels. Many officials are urging homeowners to install backflow valves and are changing new construction code requirements to incorporate backflow valves in sewer lines between the home and street.
Our "Fullport Backwater Valves" are designed to be installed on the inside of a home or building in the basement floor. In some installations, predominantly when the home is build on a concrete slab or above a crawlspace, it is not possible to install a backflow prevention valve on the inside of the building. The Mainline "Adapt-A-Valve" is designed as an economical valve to be installed outdoors in the ground. (see drawing at right)
The adapt a valve is installed in the main sewer line between your home and the street, and a piece of standard DWV (Drain Waste Vent) pipe is cut to length to reach the surface. A standard DWV cap is attached to allow access to the removable gate cassette below. (Note: extra DWV pipe & cap is not included, but is always available at your local home center or supply.)
A piece of 3/4" PVC is also cut to length and a 3/4" PVC tee is attached to the top end of this pipe to act as a "tee handle". The bottom end of this pipe is attached to the removable gate cassette. This unique feature allows the gate to easily be removed for cleaning, or in the event the drains need to be snaked, without any digging. (Note: extra PVC pipe & tee not included, but is always available at your local home center or supply.)
All of the listed components (cassette + extension adapter, backwater gate, air gate component, extension body + extension collar and cleanout lid) have been approved by the Universal Plumbing Code and IAPMO.
Additionally, depending upon the nature of your specific installation (consult your local plumbing contractor and plumbing code), the adapta valve may be used in a "normally closed" or optional "normally open" configuration.
IMPORTANT NOTE: Pipe end-to-end, the Adapt-A-Valve takes up 6" of run in your line. The outlet is 1-1/2" LOWER than the inlet, so in just 6", the level of the pipe at the outlet side now needs to be 1-1/2" lower. Depending upon the amount of slope in your line (2% minimum is required for proper operation), you may need to replace from 8 to 10 feet of pipe downstream from the valve to average out this "loss" of 1-1/2" of fall.
Mainline Fullport Backwater Valves offer the right solution for your sewer backup problems. SPECIAL OFFER: Mainline Backwater Valve "Combo" with Access Box ($99.00 value if purchased separately) Valves without Access Box are also available with a slight shipping discount in the price.
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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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