A device (1) for drawing off a liquid disclosed herein generally addresses the need to provide a device that prevents too-easy replacement of a connector plug of a nozzle system, thereby at least limiting the risks of using a treatment solution that is non-compliant with endoscope washer disinfectors (EWDs). The device (1) is contained in a container (B) such as a can, through a mouth (G) of the container, the device comprising a flexible pipe (10), a nozzle (11) intended to be immersed in the liquid from the mouth (G), a connector-plug (12), intended to be removably fastened onto the mouth (G) while plugging it, wherein the device (1) comprises an electric pump (13) arranged in the immediate vicinity of said connector-plug (12), as well as a protective case (14) housing said electric pump (13), as well as partially said plug connector (12) that is trapped in a lateral cavity (15) of said case (14) opening laterally, said case (14) having a first opening (16) for the liquid sucked up by the electric pump (13) in a wall of the lateral cavity (15), and a second opening (17), for the liquid pumped out via the electric pump (13), through which the flexible pipe (10) passes, said device (1) being configured to draw off the liquid contained in the container (B) that is sucked up, under the action of the electric pump (13), and flows successively in the nozzle (11) then through an opening of said connector-plug (12), through the first opening of the case (14), in the electric pump (13), then is pumped out by the electric pump (13) into the flexible pipe (10) through the second opening (17) of the case (14), wherein electric wires (131, 132, for example as shown in Fig. 5) for electric power supply of the electric pump (13) run along the flexible pipe (10), and are embedded as an insert in a wall thickness of the flexible pipe (10).
