1.28 gpf, metroflush piston operated exposed closet flush valve, for water closets, exposed, quiet type, chrome plated flushometer valve with polished exterior, chloramine resistant piston with a clog resistant, filtered by-pass, ada compliant with a non-hold open & no leak handle feature, high back pressure vacuum breaker, 1 piece hex coupling nut, adjustable tailpiece, spud coupling & flange for top spud connection, control stop has internal siphon-guard protection, sweat solder kit, & a cast wall flange with set screw, internal seals are made of chloramine resistant materials.