Champion Spark Plugs Champion Spark Plugs QL86C 4 High quality plugs with all the features that makes Champion spark plugs the industry's leader. Triple coated shell for excellent corrosion resistance. Triple seal assembly the strongest in the industry. Precision tooled threads conform to all manufacturers' specifications. 12 volt bulb included Base sold separately. Replacement Stow-A-Way plug-in type. 3/4" diameter anodized aluminum tube. Selective use of 2 screw holes and/or collar allow for use in multiple applications