Oatey Sure-Vent 1-1/2 in. x 2 in. PVC Air Admittance Valve with 160 DFU Branch and 24 DFU Stack

The Oatey Sure-Vent 1-1/2 in. x 2 PVC Air Admittance Valve features a 1-way valve that permits air to enter when negative pressures develop in the piping system. Closes by gravity to seal the vent terminal at zero differential pressure. Prevents sewer gases from escaping into a building.|Complies to ASSE standard 1050 and 1051|For use as a secondary vent|1-size approved to handle up to 3 in. vent pipe|Opens/closes as needed by building's plumbing system|20-DFU AAV with 1-1/2 in. x 2 in. PVC sch. 40-adapter|At zero pressure the sure-vent AAV is sealed, ready to react to pressure changes