Most newer cars have tire pressure monitoring systems that include a sensor in each wheel. On most cars the valve stem is part of the sensor. After several years, the rubber seal may start leaking and need replacing, but if the nut holding the sensor in has seized, you’ll probably break the sensor trying to remove it.
One of my coworkers found this when doing tires on a car. It appears that somebody broke the TPMS sensor either while changing tires or because the nut seized, and instead of replacing it, they chose this repair. They replaced the sensor with a regular valve stem, and then used long hose clamps to hold the broken sensor onto the wheel.
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