Model D Rev D Pressure Reducing Regulator For General Service; 1/2" Line Size; Bronze Body And Spring Chamber; B2 Trim: Brass With BUNA-N (NBR) Seat And Neoprene (BC) Diaphragm; NPT Threaded End Connections; 70-150 PSI Range Spring; Opt-25S: Stainless Steel Vented Spring Chamber Plug; Opt-55: Oxygen Cleaning Per Cashco Specification S-1134