Model "DA5" Back Pressure Regulator (Series V)-BPV; Body Size 1",Standard Diaphragm Construction; Cf3m Body,316l SST Spring Chamber; 17-4ph SST Trim, 316l SST Cage, Fkm Seat, Fkm Diaphragm;Fkm Static Seal, SST/Tfe U-Cup Dynamic Seal; 150 Lb Raised Face Flanges; 100-300 PSIG Range Spring; Large Internal Sensing, Reverse - Flow To Open Direction