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I found this bouncy ball in my garage. It is too deflated to use and too inflated to store, so I would like to inflate it or deflate it. It doesn't have a standard valve for a bike pump: the only break in the plastic shell is this solid white plug that I was unable to remove.

Bouncy ball

White plug on the bouncy ball

What is this plug, and can I inflate or deflate the ball?

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    $\begingroup$ A quick jab with a knife will permanently deflate it... $\endgroup$ – ratchet freak Sep 19 '19 at 11:27
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Yes, normally you can pull those plugs out - takes a strong grip or « folding » the ball to be able to push on the inner end of the plug...

Here is a photo with such a plug taken out:

Photo of plug out of the ball

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    $\begingroup$ How do you then inflate the ball and replace the plug? $\endgroup$ – alephzero Sep 19 '19 at 11:37
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    $\begingroup$ You fill it up (mine had a foot pump) with a tapered nozzle, and then you quickly put the plug back in before too much air leaks back out. $\endgroup$ – hazzey♦ Sep 19 '19 at 13:07
  • $\begingroup$ I was able to easily push on the inner end of the plug when the ball was partially deflated, to pump it again as per @hazzey's comment. When fully inflated, I was also able to push slightly on the inner end of the plug with a strong grip and then pull it out with pliers. $\endgroup$ – miguelmorin Sep 20 '19 at 7:58

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