Model D Rev D Pressure Reducing Regulator For General Service; 3/4" Line Size; Stainless Steel Body And Spring Chamber; S40C Trim: 316 Stainless Steel With PTFE Seat And Low Temperature Neoprene (BC) Diaphragm; Opt-31: British Standard Pipe Taper Threaded End Connections; 70-150 PSI Range Spring; Polyethylene Vented Spring Chamber Plug; Opt-40SST: Construction Per Nace Standard Mr0175