Model D Rev D Pressure Reducing Regulator For General Service; 3/4" Line Size; Carbon Steel Body And Spring Chamber; S3 Trim: 316 Stainless Steel With PTFE Seat And Neoprene (BC) Diaphragm; Special ASME Flat Face150 Flanged End Connections (11" Face To Face); 10-40 PSI Range Spring; Opt-4: Piston Stabilizer For Gaseous Service; Polyethylene Vented Spring Chamber Plug; Dye Penetrant Testing On Welds Performed By Exline Inc.; Hydro-Test On Body Sub-Assembly; Special Blank Tag