MODEL "D" SALES B KIT FOR PRODUCT CODE: 2C4-LB57-1P000000C; PRESSURE REDUCING REGULATOR,TFE-SILICATE GASKETS 1/2" SIZE; BRONZE BODY & SPRING CHAMBER (OPT-5+80), CRYOGENIC CONSTRUCTION OPT-55: CLEANED FOR OXYGEN SERVICE PER SPEC #S-1134; B5 TRIM: BRASS WITH VIRGIN TEFLON (V-TFE) SEAT,PHOS.BRONZE DIAPHRAGM