Model D Rev D Pressure Reducing Regulator For General Service; 1/2" Line Size; Carbon Steel Body With Ductile Iron Spring Chamber; S2N Trim: 416 Stainless Steel Metal Seat With Neoprene (BC) Diaphragm; Mates With ASME 150 Flanged End Connections (14" Face To Face); 10-40 PSI Range Spring; Polyethylene Vented Spring Chamber Plug