Danco 72638 Plastic Relief Valve Repair KitHighlights: Flush valve repair kit. Plastic relief valve and guide. Diaphragm type. (prior to mid year 1971) A 37 a urinal kit 1. 5 gpf watersaving (black relief valve). For use on all diaphragm type exposed or concealed regal valves and pre 1997 royal valves. Contains a 19 a relief valve, a 15 a molded disc, a 156 a diaphragm and a 163 a plastic guide. Oem reference no. 3301037. For sloan valves. Carded.