MODEL "1000HP" PRESSURE REDUCING REGULATOR,TFE/SIL. GASKETS 1/2" SIZE,GASEOUS JET; CF8M BODY & SPRING CHAMBER (OPT-36), CRYOGENIC CONSTRUCTION OPT-55: CLEANED FOR OXYGEN SERVICE PER SPEC #S-1134; S36 TRIM: 316SST CYLINDER & PLUG WITH TFE SEAT,302SST DIAPHRAGM; NPT SCREWED; 120-300 PSIG SST RANGE SPRING; OPT-12+17: ONE-STEP REDUCED ORIFICE,PISTON SPRING;