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, Gf-Tfe Seat, Gylon 3-Ply Diaphragm,;Rtfe Static Seal, SST/Tfe U-Cup Dynamic Seal; Npt End Connection; 5-20 PSIG Range Spring; Internal Sensing, Reverse - Flow To Open Direction