Model D Rev D Pressure Reducing Regulator For General Service; 1/2" Line Size; Carbon Steel Body And Spring Chamber; B2 Trim: Brass With BUNA-N (NBR) Seat And Neoprene (BC) Diaphragm; Mates With ASME 150 Flanged End Connections; 2-15 PSI Range Spring; Polyethylene Vented Spring Chamber Plug