Model "DA1" Pressure Reducing Regulator (Series I); Body Size 2-1/2",Standard Diaphragm Construction; Ductile Iron Body & Spring Chamber; 17-4ph SST Trim, 316l SST Cage, Pa Seat, Epr Diaphragm,;Epr Static Seal, O-Ring Dynamic Seal; 125 Lb Flat Face Flanges; 10-40 PSIG Range Spring; Internal Sensing, Standard - Flow To Open Direction