Oatey? Sure-Vent? 20 DFU Capacity Air Admittance Valve’s one-way valve allows air to enter the plumbing drainage system when negative pressures develop in the piping system. 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.
Complies to ASSE Standard 1050 and 1051
For use as a secondary vent
One size approved to handle up to 3″ vent pipe
Opens/closes as needed by building’s plumbing system
Rated 20 DFU?s for venting DWV 2? and smaller