Model "DA5" Back Pressure Regulator (Series V)-BPV; Body Size 2",Standard Diaphragm Construction; Sales Kit A; Carbon Steel Body & Carbon Steel Spring Chamber; 17-4ph SST Trim, 316l SST Cage, V-Tfe Seat, Fk Diaphragm;Fk Static Seal, SST/Tfe U-Cup Dynamic Seal;