Oatey Sure-Vent 39016 Air Admittance Valve, NPT, PVC

The purpose of an air admittance valve is to provide a method of allowing air to enter the plumbing drainage system without the use of a vent extended to open air and to prevent sewer gases from escaping into a building. An air admittance valve is a one way valve designed to allow air to enter the plumbing drainage system when negative pressures develop in the piping system. The device shall close by gravity and seal the vent terminal at zero differential pressure (no flow conditions) and under positive internal pressures. For plumbing drainage system Features: - Rated 20 DFU's for venting DWV 2 in and smaller - Sweet Spot™ technology opens at -0.01 psi and seals at 0 psi and above - Screening on air inlets to guard the seal - Protective rubber sleeve provides grip for installation and keeps valve free from debris - 100% functionally tested at 1/4 in H2O and 30 in H2O ensuring trouble-free performance - For use as a secondary vent - One size approved to handle up to 3 in vent pipe