Model "DA8" Differential Back Pressure Regulator (Series VIII)-PDBPV; Body Size 1-1/2",Standard Diaphragm Construction; Sales Kit A; Carbon Steel Body & Carbon Steel Spring Chamber,1/8"Steel Petcock Vent; P Trim: 17-4ph SST Trim With Polyall Seat / Gasket,Neoprene;Diaphragm; Buna-N(Nbr) Static Seals,Tfe Cap Seal W/Buna-N Energizer Dynamic Seal;