Model "DA5" SALES A KIT FOR PRODUCT CODE: D56-BSN7-1C5C00M0E; Back Pressure Regulator (Series V)-BPV; Body Size 1",Standard Diaphragm Construction; Bronze Body & Spring Chamber; 316l SST Trim, V-Tfe Seat, Be-Cu Diaphragm;SST/Tfe U-Cup Static Seal, SST/Tfe U-Cup Dynamic Seal; Opt-5: Or Opt-36: Cryogenic Construction; Opt-55: Cleaned For Oxygen Service Per Spec #S-1134