MODEL "D" PRESSURE REDUCING REGULATOR,TFE GASKETS (OPT-45) 3/4" SIZE; WCB BODY & SPRING CHAMBER; M3 TRIM: MONEL TRIM WITH FLUOROCARBON ELASTOMER (FKM) SEAT,GYLON DIAPHRAGM; NPT SCREWED; 30-80 PSIG RANGE SPRING; OPT-57: SPECIAL CONSTRUCTION FOR CHLORINE SERVICE CLEAN PER SPEC #S-1589, OPT-95: EPOXY PAINTED PER SPEC #S-1547;