IPEX 27114 Air Admittance Valve, 1-1/2 in Connection, ABS

An air admittance valve allows a drainage system to drain properly when it is impractical to connect to the plumbing vent system. The valve is normally closed to prevent sewer gases from entering the building. Features: - Threaded body allows for easy drain system access or valve cleaning - Eliminates having to install new vent lines through the roof