That cap has to press on the Schrader valve in order to provide a visual reading. If the sealing portion of the cap failed while it is pressing on the valve, the tube would leak.
I'll use a tire gauge instead.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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