Model "DA4" Sales Kit for D4C-1P17-20100000E; Pressure Loaded Reducing Regulator (Series IV)-PLPRV; Body Size 4",Standard Diaphragm Construction; Ductile Iron Body & Loading Chamber; 17-4ph SST Trim, 316l SST Cage, Pa Seat, Bc Diaphragm,;Nbr Static Seal, O-Ring Dynamic Seal;