MODEL "1000HP" PRESSURE REDUCING REGULATOR,TFE/SIL. GASKETS 1/2" SIZE,GASEOUS JET; BRONZE BODY & SPRING CHAMBER (OPT-5), CRYOGENIC CONSTRUCTION OPT-55: CLEANED FOR OXYGEN SERVICE PER SPEC #S-1134; B5 TRIM: BRASS WITH TFE SEAT,PHOS.BRONZE DIAPHRAGM; NPT SCREWED; 120-300 PSIG SST RANGE SPRING;