MODEL "DA1" PRESSURE REDUCING REGULATOR (SERIES I) BODY SIZE 1/2",STANDARD DIAPHRAGM CONSTRUCTION; CARBON STEEL BODY, DUCTILE IRON SPRING CHAMBER; 17-4PH SST TRIM, 316L SST CAGE, GF-TFE SEAT, FKM DIAPHRAGM, FKM STATIC SEAL, SST/TFE U-CUP DYNAMIC SEAL; PN40 RAISED FACE DIN FLANGES; 1-5 PSIG RANGE SPRING; INTERNAL SENSING, STANDARD - FLOW TO OPEN DIRECTION;