Model D Rev D Pressure Reducing Regulator For General Service; 1" Line Size; Stainless Steel Body And Spring Chamber; S40T Trim: 316 Stainless Steel And PTFE Seat With Fluorocarbon Elastomer (FKM) Diaphragm; Mates With ASME 300 Flanged End Connections (14" Face To Face); 10-40 PSI Range Spring; Opt-4: Piston Stabilizer For Gaseous Service; Opt-25S: Stainless Steel Vented Spring Chamber Plug; Opt-87: With 1/8" NPT Inlet And Outlet Gauge Ports And Plugs; Opt-40SST: Construction Per Nace Standard Mr0175