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Oatey Sure-Vent series 160 branch / 72 stack DFU, PVC air admittance valve (AAV). Solvent welds over 2" PVC pipe or inside a 3" PVC fitting. AAV acts as a one-way (check) valve, permitting air to enter the plumbing drainage system when negative pressures develops. Replaces the vent pipe where permitted. Overall dimensions are: 5.99" high x 3.56" wide