Model HP Rev A Pressure Reducing Regulator, Graphite/NBR Gaskets; 1/2" Line Size; LCC Steel Body With LCC Spring Chamber; S36B Trim: 316 Stainless Steel With PTFE Seat, BUNA-N O-Rings, 302 Stainless Steel Diaphragm; NPT End Connections; 180-325 PSIG Range Spring