How do you waterproof the site for an insulin pump?

Can you answer Aqua’s question about Diabetes?:

My 5 year old cousin has an insulin pump. We want to take him swimming. What is the best way to secure his site? We’ve tried Tegaderm and Band-Aids. Any suggestions? We don’t want to water log the site. If he’s in the bath very long, the skin around his site becomes loose.

If you have a pump, what do you do to keep water away from your site?

Thanks in advance!

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