Model HP Rev A Pressure Reducing Regulator With Graphite/NBR Gaskets; 1" Line Size; Sales Kit A; Stainless Steel Body With Stainless Steel Spring Chamber; S36 Trim: 316 Stainless Steel With PTFE Seat, 302 Stainless Steel Diaphragm; 340-500 PSIG Range Spring (Includes OPT-80: High Outlet Pressure Construction); OPT-56: Clean For Non-Oxygen Service Per Cashco Specification S-1542