Model "DA5" Back Pressure Regulator (Series V)-BPV; Body Size 1-1/2",Standard Diaphragm Construction; Bronze 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; 40 - 175 PSId Range Spring; Internal Sensing, Reverse - Flow To Open Direction