Model "345" Pressure Reducing Regulator,; 3/4" Size; SST Body,Bronze Spring Chamber; S1 Trim: 316SST Metal Seat,Fluorocarbon Elastomer O-Rings,;Graphite/Nbr Cylinder Gasket; Opt-34: 1500 Lb Raised Face Flanges With 14" Face To Face Dimension; 200-600 PSIG Range Spring