A cap that is threaded onto the end of the valve stem to protect against water and other contamination. Replacement valve caps are part of the service kits for snap-in and clamp-in sensors. Valve caps used with TPMS sensors should always be plastic to avoid corrosion. Most TPMS valve caps also include a rubber O-ring at the base to act as a secondary tire air seal in combination with the valve core seal.

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