Direct reducer piece NW63-50 (2½-2'') (M99-NW63 before year 02/2018)
Direct reducer piece NW90-63 (3½''-2½'') (EM4XX-NW90 after year 06/2018)
EM400/500: Optional add-on AE - blow-off unit
EM400: Optional add-on AE - blow-off unit (EM440-3x230V/10.0kW only)
EM4XX/5XX: Optional add-on DS - Adjustable airlock rotation speed
FFB 2000 Pro - FM Radio/Cable Remote Control