Model "DA5" SALES KIT FOR PRODUCT CODE: D59-AT97-4N50M000E; Back Pressure Regulator (Series V)-BPV; Body Size 2",Standard Diaphragm Construction; Cf3m Body,316l SST Spring Chamber; 17-4ph/Monel/17-4ph Trim, V-Tfe Seat, Fk Diaphragm,;Fk Static Seal, SST/Tfe U-Cup Dynamic Seal; Opt-55: Cleaned For Oxygen Service Per Spec #S-1134