Model 8311HP Rev D Back Pressure Regulator, Graphite/NBR Gaskets; 2" Line Size; Sales Kit A; Carbon Steel Body With Carbon Steel Spring Chamber; S1 Trim: 316 Stainless Steel Metal Seat, 302 Stainless Steel Diaphragm; 130-200 PSIG Range Spring (Includes OPT-80: High Inlet Pressure Construction)