Abstract: A security and pouring stopper is provided with a tubular channel (3) in which a ball (2) is situated which is able to move between two valve seats (6, 8). Next to the tubular channel (3) a radially outward chamber (10) is formed which is able to contain the ball (2) during ordinary pouring. The ball (2) has a diameter which is slightly less than the diameter of the tubular channel (3). If the bottle is overturned, the ball will be thrown or pressed through the tubular channel (3) to rest against the valve seat (8) situated at the outlet of the stopper. Here the ball will be stuck in friction or in a squeeze. When the stopper is subsequently to be made ready, the ball (2) is pressed free manually and then will place itself in position against the valve seat (6) next to the container (7) on which the stopper is mounted. The stopper will then be ready for use.