MODEL "123" BACK PRESS RELIEF REGULATOR,TFE GASKETS 1/2" SIZE; CF8M BODY & SPRING CHAMBER (OPT-36), CRYOGENIC CONSTRUCTION OPT-55: CLEANED FOR OXYGEN SERVICE PER SPEC #S-1134; S36 TRIM: 316SST WITH TFE SEAT,302SST DIAPHRAGM; NPT SCREWED; 120-245 PSIG SST RANGE SPRING