The device comprises â‰¥ 2 small vessels, connected, by way of tubes and valves, to the tanks (to be emptied), and ending in a collective pipe leading to a filter or filler. On drawing off beer, a switch from an emptied series of tanks, or single tank, to subsequent groups or single tanks is effected automatically. A signalling device, responding to very fine air bubbles in the beer current. is provided in the line of each of the small vessels. In the presence of air bubbles, this device throttles the flow until the air bubbles have been dispersed.