2pcs Champagne Stoppers - Patented Seal (no Pressure Pump Needed) - Professional Grade Champagne Bottle Stopper - Sparkling Wine Stopper How Does It Work? The sparkling wine stopper uses a simple but effective physics principle (Pascal's Law). As pressure builds inside the bottle, the plastic nipple expands outward, creating a bubble-tight seal. Use the stopper upright or on its side—the seal performs the same. BPA and Phthalate Free. Fits All Standard Bottle Necks The stopper fits any standard 750ml Champagne or Sparkling Wine bottle neck. It is compatible with 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, this design is simple and fast. Press the cap down—the seal does the rest—then secure with the stainless steel safety clip. Easy to release, even for users with limited hand strength. For best results, seal the bottle immediately after opening and keep it refrigerated.