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How do penis pumps work? These pumps, officially known as vacuum erection devices, are actually designed to cause erections in men with erectile dysfunction. By creating a pressure difference, they force blood into the penis. A constriction band is then attached to the base of the penis to reduce the outflow of blood. These devices, however, are usually available by prescription only. The pumps you see advertised are often cheap knockoffs that can be quite dangerous since they are often poorly designed and don't have the proper safety valves. Also, they usually don't come with constriction devices. The reason some people think that these pumps cause enlargement is because when you make a vacuum seal and increase the air pressure, you can force more blood into the penis then would normally occur during erection. The penis can indeed seem quite engorged, but this effect goes away within 24 hours (at most). Also, overinflating your penis with blood is not a good idea. This can cause blood vessels to burst, or even cut off peripheral circulation. The claims you see in magazines of increases of several inches are absurd. That said, some very early research suggests that regular use (every day for several months) might cause a very slight increase in penis size. However, what might be going on is that men who had blood-flow problems used these devices and found that, after time, the pump simply stretched their blood vessels back to a more normal size. If you have been prescribed such a pump for erection problems, or you are one of the men who enjoy the sensation of such vacuum pressure, you can use these devices safely and effectively, but you probably will not see any increase in size. A far better use of your time would be accepting what you have and learning to use it well!