Model "DA5" Back Pressure Regulator (Series V)-BPV; Body Size 3/4",Standard Diaphragm Construction; Bronze Body & Spring Chamber; 17-4ph/Monel/17-4ph Trim, V-Tfe Seat, Be-Cu Diaphragm;SST/Tfe U-Cup, Static Seal, SST/Tfe U-Cup Dynamic Seal; Npt End Connection; 30-150 PSIG Range Spring; Internal Sensing, Reverse - Flow To Open Direction; Opt-5: Or Opt-36: Cryogenic Construction; Opt-55: Cleaned For Oxygen Service Per Spec #S-1134