Model "DA1" Pressure Reducing Regulator (Series I); Body Size 1-1/2",Standard Diaphragm Construction; Sales Kit A; Cf3m Body,Carbon Steel Spring Chamber; P Trim: 17-4ph SST Trim With Polyall Seat,Neoprene Diaphragm,; Buna-N(Nbr) Static Seals,Tfe U-Cup W/SST Energizer Dynamic Seal; Opt-56: Special Cleaning Per Spec# S-1542