Great pump, no noise. I fix it on the bottle cap, remove the sticker, push through the cork, put the pump on. The pump itself is not fixed in any way on the bottle, but sits more or less tightly. I have never knocked it off the bottle. I really like that it never drips from the spout, like from a mechanical pump. The hose is flexible and rests on the bottom of the bottle, which allows the pump to pump out almost all the water completely. I advise you to buy.
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