Model HP Rev A Pressure Reducing Regulator With Graphite/NBR Gaskets; 1/2" Line Size; Carbon Steel Body With Carbon Steel Spring Chamber; S36 Trim: 316 Stainless Steel With PTFE Seat, 302 Stainless Steel Diaphragm; OPT-30: Mates With ASME 300 Raised Face Flanges; 400-750 PSIG Range Spring (Includes OPT-80: High Outlet Pressure Construction); OPT-56: Clean For Non-Oxygen Service Per Cashco Specification S-1542