As the name suggests, this vacuum pump mainly uses air to generate pressure. Thrust is achieved by extracting air from the vacuum bottle. This will speed up the flow of blood into the penis. Then the penis will get an erection. You can see the immediate effect of the penis on the scale of the vacuum bottle. This cock pump is easy to use. And the price is very cheap. And both have a vacuum tube. A pressure pump is designed on the tube.
https://www.buypenispump.com/
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