Model "DA1" Pressure Reducing Regulator (Series I); Body Size 1",Standard Diaphragm Construction; Carbon Steel Body & Carbon Steel Spring Chamber; 17-4ph SST Trim, 316l SST Cage, Gf-Tfe Seat, Fkm Diaphragm,;Fkm Static Seal, O-Ring Dynamic Seal; 600 Lb Raised Face Flanges; 30-150 PSIG Range Spring; Internal Sensing, Standard - Flow To Open Direction; Opt-25s: Screen For Spring Chamber Vent