Withdrawal system

A withdrawal system (1) for a container (2) comprising an immersion pipe (4) mounted on and projecting into the container (2) and having a withdrawal head (5) that is attachable by means of a rotary connection to the immersion pipe (4), characterized in that the withdrawal head (5) attached to the immersion pipe (4) is secured by means of a mechanical locking unit, characterized in that the mechanical locking unit has an actuation element that is movable into a locking position and into a release position, wherein in the locking position the actuation element locks the rotary connection between withdrawal head (5) and immersion pipe (4), and in the release position the actuation element releases the rotary connection between withdrawal head (5) and immersion pipe (4)

• wherein the mechanical locking unit has a locking element (12) firmly connected to the immersion pipe (4), said locking element having a discrete array of projections (15) running in the circumferential direction around the immersion pipe (4), the actuation element being secured at a projection (15) or between two projections (15) when in the locking position.