Powerhouse Products air operated valve holders are the perfect accessory when it's time to replace valve springs or valve stem seals. There is no easier way to keep valves from falling into the cylinders when changing valve springs. Simply thread one end into the spark plug tube and attach the other end to an air compressor. Air pressure will keep the valve from falling into the cylinder, allowing you to easily work without taking the cylinder head off. Features: * Two-step fitting works with 14mm and 18mm threads * Constant air pressure keeps valves from falling into the combustion chamber * Heavy-duty 12.000 in. flexible hose to reach from the spark plug hole to your air supply

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