Model "HP" Pressure Reducing Regulator,Graphite/Nbr Gaskets; 3/4" Size; Wcb Body & Spring Chamber; S1 Trim: 316SST Metal Seat,302SST Diaphragm; Opt-30: 600 Lb Raised Face Flanges; 340-500 PSIG Range Spring (Includes Opt-80: High Outlet Pressure;Construction)