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It doesnt use anything in the valve, it works on the ABS sensor to monitor rotation. A deflated tyre (mine pings when it has dropped half a bar) is picked up owing to the decreased rolling diameter.
Neil.D
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2000 M5  Titanium silver
Stock - The new modded
''We sleep soundly in our beds because rough men stand ready in the
night to visit violence on those who would do us harm''-Winston
Churchill
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