MODEL "CA-2" BACK PRESSURE RELIEF REGULATOR 1/2" GLOBE DESIGN,SIDE INLET,SIDE OUTLET; 316L SST BODY & SPRING CHAMBER; S2 TRIM: 303SST METAL SEAT,302SST DIAPHRAGM; NPT SCREWED; 150-250 PSIG RANGE SPRING; CRYOGENIC CONSTRUCTION (OPT-36), OPT-55: CLEANED FOR OXYGEN SERVICE PER SPEC #S-1134; B KIT