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Oatey Sure-Vent series 160 branch / 500 stack DFU, PVC air admittance valve (AAV). Solvent welds over 3" PVC pipe or inside a 4" 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: 7.39" high x 4.10" wide