Model "DA5" Back Pressure Regulator (Series V)-BPV; Body Size 2",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; 50-150 PSIG Range Spring; Internal Sensing, Reverse - Flow To Open Direction