Model HP Rev A Pressure Reducing Regulator With Graphite/NBR Gaskets; 1/2" Line Size; Carbon Steel Body With Carbon Steel Spring Chamber; S3Y Trim: 316 Stainless Steel With Nylon Seat, Neoprene (BC) Diaphragm; OPT-30: Mates With ASME 900 Raised Face Flanges; 120-225 PSIG Range Spring