Model HP Rev A Pressure Reducing Regulator With Graphite/NBR Gaskets; 1/2" Line Size; Sales Kit A; Manganese Bronze Body With Manganese Bronze Spring Chamber; S36 Trim: 316 Stainless Steel With PTFE Seat, 302 Stainless Steel Diaphragm; 10-40 PSIG Range Spring; OPT-1+6: Differential Construction With Closing Cap