Self-extracting stopper for a container, comprising a wing nut, a screw, a drum, a flexible cylinder, a nut and a cork cover, whereby - the screw has a threaded section, and a not threaded section, which ends in a square head; - the wing nut has wing nut fins that allows a user to manually turn the stopper by using thumb and index fingers and therefore extract and/or replace the stopper from the bottleneck of a container where it is installed, the wing nut further comprises a squared wing nut fitting for the square head of the screw, and a groove along its axis to facilitate its withdrawal it from the container; - the drum has anti-rotation fittings on one side, and anti-rotation wings on an opposite side incorporated radially on a drum guide neck, the drum further comprises a drum hole that allows passage of the threaded section of the screw but does not allow passage of the not threaded section; - the nut is screwed by the threaded section of the screw, and has anti-rotation fins attached to a neck of the nut; - the flexible cylinder is located between the nut and the drum, and is axially perforated to allow the passage of the drum guide neck, the flexible cylinder further presents on opposite sides fittings for the drum wings and fittings for the anti-rotation nut fins to prevent the nut from rotating when introducing the screw, whereby, when the screw is screwed into the nut the flexible cylinder is compressed between the drum and the nut, expanding towards the walls of a bottleneck of the container where it is installed, therefore putting pressure on them and closing the bottleneck; and - the cork cover is welded to the nut sealing the side of the stopper touching the liquid in the container. - the screw has a threaded section, and a not threaded section, which ends in a square head; - the wing nut has wing nut fins that allows a user to manually turn the stopper by using thumb and index fingers and therefore extract and/or replace the stopper from the bottleneck of a container where it is installed, the wing nut further comprises a squared wing nut fitting for the square head of the screw, and a groove along its axis to facilitate its withdrawal it from the container; - the drum has anti-rotation fittings on one side, and anti-rotation wings on an opposite side incorporated radially on a drum guide neck, the drum further comprises a drum hole that allows passage of the threaded section of the screw but does not allow passage of the not threaded section; - the nut is screwed by the threaded section of the screw, and has anti-rotation fins attached to a neck of the nut; - the flexible cylinder is located between the nut and the drum, and is axially perforated to allow the passage of the drum guide neck, the flexible cylinder further presents on opposite sides fittings for the drum wings and fittings for the anti-rotation nut fins to prevent the nut from rotating when introducing the screw, whereby, when the screw is screwed into the nut the flexible cylinder is compressed between the drum and the nut, expanding towards the walls of a bottleneck of the container where it is installed, therefore putting pressure on them and closing the bottleneck; and - the cork cover is welded to the nut sealing the side of the stopper touching the liquid in the container.