Model 1000HP Rev A Pressure Reducing Regulator, Cleaned For Hydrogen Service Per Cashco Specification S-1821; 1-1/2" Line Size: Gaseous Service; Stainless Steel Body With Stainless Steel Spring Chamber; S36 Trim: 316 Stainless Steel Cylinder And Plug With PTFE Seat, 302 Stainless Steel Diaphragm; NPT End Connections; 80-225 PSIG Range Spring