Oatey Sure-Vent 39018 Air Admittance Valve, 1-1/2 to 2 in Connection, Snap-On, ABS

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. For drain and sewer Features: - For use as a secondary vent - One size approved to handle up to 3 in vent pipe - Opens/closes as needed by building's plumbing system