Model "8310HP" Pressure Reducing Regulator, Graphite/Nbr Gaskets; 3" Size; Cast Iron Body & Ductile Iron Spring Chamber; S1 Trim: 316SST Metal Seat,302SST Diaphragm; 250 Lb Raised Face Flanges; 30-100 PSIG Range Spring; Opt-56: Special Clean Per Spec #S-1542