In the office, we use them on bottles that are 19 liters. This was purchased to replace a hand pump. The battery life should be sufficient for four bottles. It is mounted directly on the plastic cork, and all that is required to replace bottles is to remove the plastic and squeeze out the inner cork. This makes the process of switching out bottles much more straightforward. There are neither leaks nor drips to be found. But it does function, even though it's too loud for the office. I suggest
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