Model HP Rev A Pressure Reducing Regulator, Graphite/NBR Gaskets; 1" Line Size; Stainless Steel Body With Stainless Steel Spring Chamber; S36B Trim: 316 Stainless Steel With PTFE Seat, BUNA-N O-Rings, 302 Stainless Steel Diaphragm; OPT-30: Mates With ASME 600 Raised Face Flanges; 30-150 PSIG Range Spring; OPT-56: Clean For Non-Oxygen Service Per Cashco Specification S-1542