Stopper and vacuum saver that maintains pressure inside the bottle once it has been opened, preserving the effervessence and flavours of the sparkling wine. Instructions for use: To close, place the stopper on the lip of the bottle and press hard to insert its inner part into the bottleneck. Then turn the rotating ring in the lower part of the stopper to the lock position, and pump up to inject air. To open, place one hand on the stopper to prevent it from being expelled due to the pressure, while turning the rotating ring back to the open position with the other hand. Keep out of reach of children.