MODEL "4381" PRESSURE REDUCING REGULATOR, TFE GASKET/O-RING 1/2" SIZE; 316L SST BODY & CF3M SST SPRING CHAMBER; S6 TRIM: 316L SST WITH EPR SEAT,EPDM DIAPHRAGM; SPECIAL END CONNECTION; 20-80 PSIG RANGE SPRING; PER SPQ NUMBER 57484 WITH BSPP SCREWED END CONNECTIONS;