Model 8310HP Rev D Pressure Reducing Regulator, Graphite/NBR Gaskets; 1-1/2" Line Size; Carbon Steel Body With Carbon Steel Spring Chamber; S1 Trim: 316 Stainless Steel Metal Seat, 302 Stainless Steel Diaphragm; OPT-30: Mates With ASME 300 Raised Face Flanges; 30-100 PSIG Range Spring; OPT-1: Closing Cap