Oatey 39225 1.5'' 6 DFU Sure-Vent AAV 1-1/2'' Tubular adapter (white) one-way valve by Oatey at The Synthesizer. MPN: 39225. Hurry! Limited time offer. Offer valid only while supplies last. Oatey? Sure-Vent? 6 DFU Capacity 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 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 draina
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