MODEL "DA5" BACK PRESSURE REGULATOR (SERIES V)-BPV BODY SIZE 1",STANDARD DIAPHRAGM CONSTRUCTION; DUCTILE IRON BODY & SPRING CHAMBER; 17-4PH SST TRIM, 316L SST CAGE, PA SEAT, NBR DIAPHRAGM NBR STATIC SEAL, SST/TFE U-CUP DYNAMIC SEAL; NPT END CONNECTION; 1-5 PSIG RANGE SPRING; INTERNAL SENSING, REVERSE - FLOW TO OPEN DIRECTION;