Model "DA1" Pressure Reducing Regulator (Series I); Body Size 1/2",Standard Diaphragm Construction; Carbon Steel Body & Carbon Steel Spring Chamber; 17-4ph SST Trim, 316l SST Cage, Ctfe Seat, Bc Diaphragm,;Nbr Static Seal, SST/Tfe U-Cup Dynamic Seal; Npt End Connection; Opt-80: 200-450 PSIG Range Spring; Internal Sensing, Standard - Flow To Open Direction