Model D Rev D Pressure Reducing Regulator For General Service; 3/8" Line Size; Ductile Iron Body And Spring Chamber; M1 Trim: Monel Metal Seat With 302 Stainless Steel Diaphragm; NPT Threaded End Connections; 2-15 PSI Range Spring; Polyethylene Vented Spring Chamber Plug; Opt-87: With 1/8" NPT Inlet And Outlet Gauge Ports And Plugs