Two-lever radiation box for two chrome aluminum motors. The B104 control box is not equipped with a trim control button. By pressing the side button on the lower part of the handle, the engine speed can be raised without the gear engaged - for example, to warm up the engine with the required number of revolutions. Protective switch X43 (not supplied) prevents the engine from running when the gear is engaged. The C2 and C7 sprockets are connected directly to the Volvo Penta, and the K33 adapter is required to connect the original Penta rod.