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 flat—the seal performs consistently in any position. BPA and phthalate free. Fits all standard 750ml champagne and sparkling wine bottle necks. 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 stoppers, this champagne stopper requires no complex mechanisms. Simply press the cap down and secure with the stainless steel safety clip. The design allows for easy handling, even for those with limited hand strength. For best results, seal the bottle immediately after opening and keep refrigerated.