Model D Rev D Pressure Reducing Regulator For General Service (Opt-20: Dome Loaded); 1" Line Size; Stainless Steel Body And Stainless Steel Loading Chamber; SK Trim: 316 Stainless Steel With FKM Seat And FKM Diaphragm; Mates With ASME 150 Flanged End Connections (14" Face To Face); Opt-4: Piston Stabilizer For Gaseous Service; Opt-87: With 1/8" NPT Inlet And Outlet Gauge Ports And Plugs