Model D Rev D Pressure Reducing Regulator For General Service; 3/4" Line Size; Carbon Steel Body And Spring Chamber; S2 Trim: 416 Stainless Steel Metal Seat And 302 Stainless Steel Diaphragm; NPT Threaded End Connections; 30-80 PSI Range Spring; Opt-25S: Stainless Steel Vented Spring Chamber Plug