Model "DA1" Pressure Reducing Regulator (Series I); Body Size 1",Standard Diaphragm Construction; Sales Kit A; Carbon Steel Body & Carbon Steel Spring Chamber; P Trim: 17-4ph SST Trim With Ctfe Seat,Neoprene Diaphragm,; Buna-N(Nbr) Static Seals,Tfe U-Cup W/SST Energizer Dynamic Seal;