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. <EOS>