Model "DA1" Pressure Reducing Regulator (Series I); Body Size 1-1/2",Standard Diaphragm Construction; Sales Kit A; Bronze Body & Spring Chamber; P Trim: 17-4ph SST Trim With Polyall Seat,Neoprene Diaphragm,; Buna-N(Nbr) Static Seals,Buna-N(Nbr) O-Ring Dynamic Seal;