"Valve core" is also called "airtight core". Mainly used for air intake of tires and to prevent tire air leakage. The main body of the "valve core" is a small section of cylinder with a hollow upper end and a solid lower end. A small hole is opened on the side of the lower end to communicate with the hollow part. The valve cores are mainly divided into: British valve needles, American valve cores, French valve cores, and German valve needles and Italian valve cores.
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