Model HP Rev A Pressure Reducing Regulator With Graphite/NBR Gaskets; 1/2" Line Size; Sales Kit B; Stainless Steel Body With Carbon Steel Spring Chamber; S1 Trim: 316 Stainless Steel Metal Seat, 302 Stainless Steel Diaphragm; 340-500 PSIG Range Spring (Includes OPT-80: High Outlet Pressure;Construction)