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Valve Holder for 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 w/ two step fitting for both 14mm & 18mm threads.Heavy duty 12" flexible hose allows easy access to spark plug hole & air supply.Thread fitting to spark plug hole & other end to air supply.Shipping weight 4 oz.
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