Features and Benefits: Cleans any size spark plug quickly and effortlessly with internally controlled abrasive blast. Uses ordinary air line pressure Compressed air flows through a special venturi mixture with abrasive to thoroughly clean the spark plugs as the new lever valve on the outside of the unit allows blasting with abrasive/air mixture or alone pure air Recommended air line pressure is 70-80 PSI maximum 90 PSI. Abrasive material is included and does not contain silica. Instructions are provided.