Oatey® Sure-Vent® Air Admittance Valve, 1-1/2 to 2 in Nominal, NPT, -40 to 150 deg F, 20 dfu, 2.46 in Inlet to Outlet Length, ABS Body, 4.53 in H
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.