These stoppers are the accessories, the accoutrements, if you will, to the Vac U Vin system. However, they work reasonably well on their own. Once the stopper is placed in the bottle, just squeeze the top to open the stopper and let out as much air as will escape, then let it go and it will self-seal. I actually use this system myself, though most of the time I use the Vac U Vin pump as well.
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