Delivery system

The screen washer system, to pump liquid to different windows (13,15) in a vehicle to keep them clean, has a pump (2) which can force the cleaning fluid in two directions and at different pressures. The hose (12) to carry the lower pressure, e.g. for the rear window, can be an inexpensive installation. The rotor can distort in one direction of rotation, according to the direction of the electromotor (1) rotation for the pump.