Metrokane's Houdini Wine Preserver is the #1 selling preserver of its kind in the U.S. The pump-and-stopper vacuum system has three major improvements over competing systems: * The pump handle is ergonomically designed for easier pumping action and to avoid pinching * Two Push-Button Stoppers (included) employ a patented valve that holds a vacuum for days and releases at the touch of a button * Bottles sealed with Push-Button Stoppers can be stored horizontally, while those sealed with some competing stoppers must be stored upright to prevent leakage