Model "DA2" Differential Pressure Reducing Regulator (Series II)-PDRV; Body Size 1/2",Standard Diaphragm Construction; Cf3m Body,Carbon Steel Spring Chamber,1/8" Petcock Vent; 316l SST Trim, V-Tfe Seat, Fk Diaphragm,;Fk Static Seal, SST/Tfe U-Cup Dynamic Seal; 300 Lb Raised Face Flanges; 10-35 PSId Range Spring; Internal Sensing, Standard - Flow To Open Direction