I purchased one of these pumps about 1 year ago. I used it to pump up an inflatable ball pit and it worked great. It inflates things quickly due to the output of air on both the up and down strokes. However, after using it only 6-8 times, the inner mechanism was not working properly and when it did still pump, the amount of air being pumped was reduced. Finally, it would not pump air at all. Not a great bargain at over a dollar per use. : (