2 pcs Champagne Sealers - Patented Seal (no pressure pump needed) - Professional Champagne Bottle Sealer - Sparkling Wine Sealer How does it work!? Sparkling wine sealers are smarter than your average sealer. The seal uses a simple but brilliant principle of physics (Pascal's Law). As pressure builds up inside the bottle, the plastic nipple expands outwards, creating a bubble-tight seal. Lay your bottle flat or stand it upright and the seal works the same. BPA and phthalate-free. Fits all standard bottle necks The shape of the bottle can be anything - if the neck is a standard 750 ml champagne or sparkling wine bottle neck (and we all know what that looks like), then this champagne preserver will fit. It can be used for Prosecco, Cava, some Magnum and 187 ml bottles, and many large beer or cider bottles. Easy to use Unlike the outdated style of champagne bottle sealers (the exploding spring-loaded type), our champagne saver is simple and quick. Just press down the cap (the seal does the rest of the work for you) and then lock with the stainless steel safety clip. It's easy to release, even with arthritic hands! And the key to maximum bubbles is to seal your bottle immediately and keep it ice cold.