Model 1000HP Rev A Pressure Reducing Regulator For Standard Service; 1/2" Line Size, Liquid Jet; Carbon Steel Body With Carbon Steel Spring Chamber; S1 Trim: 316 Stainless Steel Cylinder And Plug With Metal Seat, 302 Stainless Steel Diaphragm; NPT End Connections; 10-50 PSIG Range Spring; OPT-15: Stellited Seat Surface (Includes OPT-14: Integral Seat)