Wine Vacuum Stopper(Patented structure,Easily used). Material:Plastic/Stainless Steel Product Size:Dia:4.5cm*H:7.1cm Instructions:1,Cover the bottle mouth with the stopper. 2,Press the intermediate button quickly (6-7 times) to push out the air in the bottle. 3,Check wether the bottle will depart from the stopper.If won't,the air-pushing is finished. 4,Joggle the stopper slightly to pull it out next time you want to drink. 5,The stopper can keep your wine fresh for half a year.
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