On Thursday, June 7, 2018 at 12:14:15 AM UTC-4, bob wrote:
replying to trader4, bob wrote:
How do replace the air valve if it's bad?

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The ones I've seen were just shrader valves like those that go in
a car tire. Screw it out with a valve removal tool or a metal valve
cap that has that feature on the end. You then have to charge it to
the correct air pressure.