How Does It Work? Our sparkling wine stopper is designed with a smart, simple principle (Pascal's Law). As pressure builds inside the bottle, the plastic nipple expands outward, creating a secure seal. Whether you lay your bottle flat or stand it upright, the seal works effectively in both positions. BPA and Phthalate Free. Fits All Standard Bottle Necks The stopper fits any standard 750ml Champagne or Sparkling Wine bottle neck. It can be used for Prosecco, Cava, some Magnum and 187ml bottles, as well as many large format beer or cider bottles. Easy To Use Unlike traditional spring-loaded Champagne stoppers, our Champagne Saver is simple and fast to use. Simply press the cap down—the seal does the rest—and lock it in place with the stainless steel safety clip. It’s easy to release, even for those with limited hand mobility. For best results, seal your bottle immediately after opening and keep it chilled.