For Both 14mm & 18mm Spark Plug Threads
- Commonly used when valve springs or valve stem seals are replaced
- Air pressure helps prevent the valve from falling into the combustion chamber
- Comes with two-step fitting for both 14mm and 18mm threads
- Heavy duty 12" flexible hose allows easy access to spark plug hole and air supply
- Thread fitting to spark plug hole and other end to air supply
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