Features and Benefits: Cleans any size spark plug quickly and effortlessly with internally controlled abrasive blasting.; Uses ordinary air line pressure; Compressed air flows through special venturi mixing with abrasive to thoroughly clean spark plugs like new; Lever valve on outside of unit allows for blasting with abrasive/air mix or pure air only; Recommended air line pressure is 70-80 PSI; maximum 90 PSI.; Cleans any size spark plug with internally controlled abrasive blasting. Uses ordinary air line pressure. Lever valve on outside allows for blasting with abrasive/ air mix or air only.