Model "DA5" Back Pressure Regulator (Series V)-BPV; Body Size 1",Standard Diaphragm Construction; Hastelloy C Body,316l SST Spring Chamber; Hastelloy-C Trim, Gf-Tfe Seat, Fkm Diaphragm;Fkm Static Seal, Hastelloy-C U-Cup Dynamic Seal; 150 Lb Raised Face Flanges; 1-5 PSIG Range Spring; Internal Sensing, Reverse - Flow To Open Direction