Pump with selectable suction ports

A reversible circular pump-motor-unit with a pump housing comprising a suction chamber (72) and a pressure chamber with an outlet port (80), the suction chamber (72) comprising two inlet ports (77, 78) whose axes run almost vertical to each other, a shaft (75) running parallel to the axis of rotation of the pump-motor-unit connecting a first vane (73) positioned at the pressure side and a second vane (79) positioned within the suction chamber (72) with each other, whereby the second vane (79) in a first position closes a first inlet port (78) and in a second position closes the second inlet port (77), whereby at a clockwise rotation of the pump impeller (71) the first vane (73) at the pressure side moves the second vane (79) within the suction chamber such that it closes the second inlet port (78), and at a counter-clockwise rotation of the pump impeller (71) the first vane (73) moves into the opposite position whereby the second vane (79) closes the first inlet port (77).