Model HP Rev A Pressure Reducing Regulator With Graphite/NBR Gaskets; 1" Line Size; Sales Kit B; Manganeze Bronze Body With Manganeze Bronze Spring Chamber; S36 Trim: 316 Stainless Steel With PTFE Seat, 302 Stainless Steel Diaphragm; 400-750 PSIG Range Spring (Includes OPT-80: High Outlet Pressure Construction); OPT-56: Clean For Non-Oxygen Service Per Cashco Specification S-1542