MODEL "345" PRESSURE REDUCING REGULATOR, 3/4" SIZE; SST BODY,BRONZE SPRING CHAMBER; S1 TRIM: 316SST METAL SEAT,FLUOROCARBON ELASTOMER O-RINGS, GRAPHITE/NBR CYLINDER GASKET; SPECIAL END CONNECTIONS; 900-3000 PSIG RANGE SPRING; PER SPQ NUMBER 51858 1500# RTJ FLANGES;