Model D Rev D Pressure Reducing Regulator For General Service; 3/4" Line Size; Ductile Iron Body And Spring Chamber; With Special B2 Trim: Brass With BUNA-N (NBR) Seat And 302 Stainless Steel Diaphragm; NPT Threaded End Connections; 30-80 PSI Range Spring; Polyethylene Vented Spring Chamber Plug