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; Mates With ASME 150 Flanged End Connections; 2-15 PSI Range Spring; Opt-4: Piston Stabilizer For Gaseous Service; Polyethylene Vented Spring Chamber Plug; Per SPQ 55173 Dye Penetrant Tested On Welds; Hydro-Test On Body Sub-Assembly; Special Tag Included;