Model HP Rev A Pressure Reducing Regulator With Graphite/NBR Gaskets; 1-1/2" Line Size; Sales Kit A; Carbon Steel Body With Carbon Steel Spring Chamber; S1 Trim: 316 Stainless Steel Metal Seat, 302 Stainless Steel Diaphragm; 30-100 PSIG Range Spring; OPT-15: Stellited Seat Surface