Single-piece wine bottle stopper with built-in pressure pump. Removes air from your wine bottle to keep the taste of the wine fresh for up to a week. Very easy to use. Place the vacuum stopper in the bottle and pump until you feel strong resistance. Now you have an airtight seal. Fits most wine bottles with an internal diameter of 18-19mm. Wipe it with a soft damp cloth. Note: when using the stopper, it is preferable not to store the bottles horizontally. Dimensions: 5.5x4 cm.