Model "DA1" Pressure Reducing Regulator (Series I); Body Size 4",Standard Diaphragm Construction; Cf3m Body, 316l SST Spring Chamber; 17-4ph SST Trim, 316l SST Cage, Pa Seat, Epr Diaphragm,;Epr Static Seal, O-Ring Dynamic Seal; 150 Lb Raised Face Flanges; 50-225 PSIG Range Spring; Internal Sensing, Standard - Flow To Open Direction