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; 30-150 PSIG Range Spring; OPT-1: Closing Cap