We replaced our rubber valve stems with metal valve stems after we had a flat from a stem failure while using tire pressure monitors that attach to the valve stems. I believe the TPM system added to the flexing and stress to the rubber stem. For those using TPM systems that attach to the stems, I'd recommend metal replacements. In fact, I'd recommend them in general the next time you get new tires.
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TB & Greg and Abbey Schnauzer
AirForums #21900
PastPrez, 4CU/WBCCI
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