Ayrlett 2 in. or 1-1/2 in. 20 DFU PVC Air Admittance Valve

Air admittance valves (AAVs) are one way valves that allow air in, to vent or equalize pressure in waste pipes, without allowing gases, odors or liquid out. Our AAVs have been tested by an independent U.S. lab 500,000 cycles, in temperatures ranging from -40°F to 150°F, without a single failure. Check local plumbing codes prior to installation.