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 upright or lay the bottle flat—the seal performs the same. BPA and Phthalate Free. Fits All Standard Bottle Necks—The shape of the bottle may vary, but if the neck is a standard 750ml Champagne or Sparkling Wine bottle neck, this stopper will fit. Compatible with Prosecco, Cava, some Magnum and 187ml bottles, and many large format beer or cider bottles. Easy To Use—Unlike outdated spring-loaded Champagne stoppers, this design is simple and secure. Press the cap down (the seal completes the sealing process), then lock in place 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 chilled.