Model "DA5" Back Pressure Regulator (Series V)-BPV; Body Size 2",Standard Diaphragm Construction; Cf3m Body,316l SST Spring Chamber; 316l SST Trim, V-Tfe Seat, Be-Cu Diaphragm;SST/Tfe U-Cup Static Seal, SST/Tfe U-Cup Dynamic Seal; 150 Lb Raised Face Flanges; 30-90 PSIG Range Spring; Internal Sensing, Reverse - Flow To Open Direction