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