An apparatus (1) for filling containers with a liquid, having an outlet opening (2) via which the liquid can be filled into the container, having a liquid line (8) in order to feed the liquid to the outlet opening (2), and having a closing body (10) which can be moved between at least two positions in relation to the outlet opening, wherein the closing body (10) rests against the outlet opening (2) in a first position in order to close said outlet opening. According to the invention, the apparatus (1) has a first magnetic or magnetized element (12) which is arranged in a stationary manner in relation to the outlet opening (2) and interacts with a second magnetic or magnetized region (16) of the closing body (10) in order to move the closing body (10).