For Venting single fixtures, kitchen sinks and bathroom groups including back to back applications up to 20 DFU;Exclusive vermin protection system;Expands architectural design limits;Compact design for tight applications;Fits 1-1/2" and 2" pipe sizes;Limited lifetime warranty for replacement of defective valves;Residential or Commercial Use;ANSI/ASSE 1051, ANSI/ASSE 1050, NSF 14, ETL, ICC-ES PMG-1025, C-IAPMO