Sure-Vent 1-1/2 in. PVC Air Admittance Valve - 20 DFU Branch, 8 DFU Stack

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 1-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 use as a secondary ventComplies to ASSE standard 1050 and 10511-size approved to handle up to 2 in. vent pipeOffers unmatched breathing capability with a unique sealing systemCloses by gravityLimited warranty