Oatey® Sure-Vent® Air Admittance Valve, 1-1/2 in Nominal, NPT, -40 to 150 deg F, 6 dfu, 4 in Inlet to Outlet Length, PVC Body, 7-3/4 in H
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.