Extended Information. Oatey Air Admittance Valve, Series: Sure-Vent, 1-1/2 - 2 in Nominal, 20 DFU Nominal, PVC Body, Neoprene Tension Membrane Softgoods, ASSE 1050 and 1051, ICC ESR-1664, NSF Standard 14, IAPMO Listed, ASTM D 2665/D 2661, For Use as a secondary Vent. Manufacturer: OATEY.
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