The pump is squeezed and held in place by a flat double plastic hook. It's a little tricky to squeeze the pump back after use, but it's possible with a little effort. The pump inflated my exercise ball in just a few pumps. It was wonderful! My main issue, which I deducted a star for, was that the various plastic adapters are made out of fairly cheap plastic. They fit into the included tubing and attach with a small lip that fits into the channel and wraps around the crease that holds them there. The one adapter I tried to use did NOT allow me to get that little protrusion over the duct bend, although other adapters did. So I used another similarly shaped adapter and it worked. The hose was also a bit tricky to attach to the pump, but I managed. Overall it's a lot better than the tiny foot pump that came with the stability ball and I'm very happy with it.
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