MODEL "DA4" PRESSURE LOADED REDUCING REGULATOR (SERIES IV)-PLPRV BODY SIZE 1 1/2", SALES KIT A; OPT-81: FULL DIAPHRAGM SUPPORT CONSTRUCTION; CARBON STEEL BODY & CARBON STEEL LOADING CHAMBER; SPECIAL TRIM MATERIALS; PER SPQ NUMBER 56723 TRIM: PLUG 17-4PH SST, CAGE 316SST, POLYALL SEAT, DIAPHRAGM NEOPRENE/NYLON (TRELLOBORG 7421), STATIC SEALS NBR, DYNAMIC SEAL SST/TFE UCUP