The invention relates to a device for receiving liquids in an aircraft and/or releasing liquids therefrom, especially during the flight, said device being arranged especially in an airplane. The aim of the invention is to provide a device which can receive large quantities of liquids in a rapid, reliable and flexible manner. To this end, the device can include a tank module with at least one tank container that is connected to a collector using a connecting shaft and a bulkhead module that can be connected to the tank module by the collecting tank. A closing element in the open position releases liquid from the tank module. In addition, a refueling module which is connected to the tank module by a supply line and a tube arranged on a winding device, and a receiving element attached to the tube, can provide refueling of the device.