Oatey® 3" – 4" 500 DFU Sure-Vent AAV 3" x 4" Sch. 40 PVC adapter
$42.49
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Oatey® Sure-Vent® 500 DFU Capacity Air Admittance Valve's one-way valve is designed to allow air to enter the plumbing drainage system when negative pressures develop in the piping system. Complies to ASSE Standard 1050 and 1051For use as a secondary ventOne size approved to handle up to 4" vent pipeOpens/closes as needed by building's plumbing system
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