Model D Rev D Pressure Reducing Regulator For General Service; 1/2" Line Size; Carbon Steel Body And Spring Chamber; S36 Trim: 316 Stainless Steel With PTFE Seat With 302 Stainless Steel 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