The driving motor type D-720 serves to the expanding and expansion of tubes with small Ø 6,3 mm - 12,7 mm, dependent of wall thicknessand material, into heater radiators, condensers, coolers, etc.. Upon reaching the stopped torque the D-720 goes automatically into the counterclockwise rotation. The attitude of the correct torque is achieved above an interior spring load-covered clutch. The small weight, as well as the ergonomic fitting of the machine onto the given operating conditions, facilitate a fast workflow. For a trouble-free course, a corresponding maintenance entity must be pre-connected, this is available as a further option.