2 extra stoppers for any of our Electric Vacuum Preserver or Electric Corkscrew and Vacuum Preserver Gift Set . Fits necks of all 750ml bottles. When inserting the stopper into your bottle of wine, please push it down and give it a slight twist to create the best possible seal before vacuuming. Vacuuming is complete once the preserver stops its motion. Properly sealed wine should be able to be stored on its side however leaking is possible if stored for extended periods of time or if bottle is turned upside down.