The large variety of vacuum pumps is astounding and it’s where you’ll find some real value. While the hand pumps do not replace oxygen with inert gasses, they do remove the oxygen from the bottle and then seal it to provide the consumer with time. How much time? It all depends on where the bottle is kept, how much light it sees (too much light=bad), what’s the ambient temperature around the bottle (hint: keep it away from the stove and the toaster), etc. But, if stored reasonably in a cool dry place, or even in a refrigerator for a short time, the vacuum pumps are a great way to go and probably a better value than any other wine stopper system.
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