Model HP Rev A Pressure Reducing Regulator With Graphite/NBR Gaskets; 1" Line Size; Stainless Steel Body With Stainless Steel Spring Chamber; S36Y Trim: 316 Stainless Steel With Nylon Seat, 302 Stainless Steel Diaphragm; NPT End Connections; 180-325 PSIG Range Spring; OPT-1: Closing Cap; OPT-58: Cleaned For Hydrogen Service Per Cashco Specification S-1821