4 Pcs Expanding Beverage Bottle Stopper, Silicone Reusable Wine Bottle stopper and Beverage Bottle Stoppers

This bottle top sealer is supposed to hold the remaining liquid in the bottle and not let the remaining pressure be released.However when I put the top on, and turned the bottle up-side down, it leaked, so obviously the top wasn't wasn't even air tight, let alone being able to hold air pressure in.WORTHLESS!!!