Sure-Vent air admittance valve with PVC Sch. 40 adapter;One size approved to handle 1-1/2 in. to 2 in. vent pipe;Use as an alternative to a secondary vent in a DWV system;Vents up to 160 DFU Branch or 24 DFU Stack;Protective sleeve provides grip for installation and keeps valve free from debris;100% functionally tested at 1/4 in. H2O and 30 in. H2O, ensuring trouble-free performance;Complies to ASSE Standard 1050 and 1051;International Plumbing Code (IPC) and Uniform Plumbing Code (UPC) approved;For warranty product details, refer to the Oatey Limited Warranty document