Model D Rev D Pressure Reducing Regulator For General Service; 1" Line Size; Carbon Steel Body And Spring Chamber; B2 Trim: Brass With BUNA-N (NBR) Seat And Neoprene (BC) Diaphragm; Mates With ASME 300 Flanged End Connections (Special 10 3/4" Face To Face); 30-80 PSI Range Spring; Polyethylene Vented Spring Chamber Plug