The liquid manure vessel, also where it is installed on a vehicle, has a filling and emptying device, with a pump and vacuum compressor for its evacuation. It also has a drive unit connectable to the drive shaft of a towing vehicle. The drive unit (3) has a differential (14) and the pump (1) together with the vacuum compressor (2) are each connected by a shaft (15,16) with the differential. In the drive unit a gear (17) is incorporated. The pump is particularly of the wet-running centrifugal type. The pump and/or the vacuum compressor can also be directly connected with the differential. In the vessel (9) is a closable venting device. The vacuum pump is equipped with an automatic cut-out, e.g. a time relay. The time relay and the venting device are connected to each other from a control technique point of view.