Model "DA5" Back Pressure Regulator (Series V)-BPV; Body Size 3/4",Standard Diaphragm Construction; Cf3m Body,316l SST Spring Chamber; 17-4ph SST Trim, 316l SST Cage, Gf-Tfe Seat, Gylon 3-Ply Diaphragm,;Rtfe Static Seal, SST/Tfe U-Cup Dynamic Seal; Npt End Connection; 1-10 PSIG Range Spring; Internal Sensing, Reverse - Flow To Open Direction; Opt-56: Special Cleaning Per Spec #S-1542