Model "DA8" Differential Back Pressure Regulator (Series VIII)-PDBPV; Body Size 3",Standard Diaphragm Construction; Sales Kit A; Carbon Steel Body & Carbon Steel Spring Chamber,1/8" Petcock;Vent; 316l SST Trim, Gftfe Seat, Fkm Diaphragm,;Fkm Static Seal, Tfe Cap Seal, W/Fkm Energizer Dynamic Seal;