MODEL "DA2", DIFFERENTIAL PRESSURE REDUCING REGULATOR (SERIES II)-PDRV; BODY SIZE 1"; SALES KIT A; STANDARD DIAPHRAGRM CONSTRUCTION; 17-4PH SST PLUG/CAGE/PISTON, 6-PLY TFE+HK DIAPHRAGM, GF-TFE SEAT; REINFORCED TFE (BRZ-FILL) STATIC SEALS, GF-TFE PISTON RING ASSEMBLY W/ SST ENERGIZER DYNAMIC SEAL;