Model HP Rev A Pressure Reducing Regulator With Graphite/NBR Gaskets; 1/2" Line Size; Sales Kit A; Stainless Steel Body With Stainless Steel Spring Chamber; S36Y Trim: 316 Stainless Steel With Nylon Seat, 302 Stainless Steel Diaphragm; 10-40 PSIG Range Spring; OPT-1+6: Differential Construction With Closing Cap