Model HP Rev A Pressure Reducing Regulator With Graphite/NBR Gaskets; 1" Line Size; Stainless Steel Body With Stainless Steel Spring Chamber; S1 Trim: 316 Stainless Steel Metal Seat, 302 Stainless Steel Diaphragm; OPT-30: Mates With ASME 600 Raised Face Flanges; 120-225 PSIG Range Spring