Kitcheniva Wine Bottle Stopper Plug With Vacuum Seal1 Piece Wine Saver Vacuum Stoppers, Air Tight Wine Bottle Stoppers with Silicone, Reusable Wine Saver Pump, Silver Plated Polished Finish Wine Sealer, Leak Proof Easy to Use: Place the vacuum stopper on top of an opened bottle and press the lever to seal the bottle airtight, push the button on top by gently press, pump the air out until you fell a strong air resistance, and turn the bottle to mark the number of the exact date you opened your bottle.