Champion Spark Plug J4C #825 Replaces: J2J J4 J4J J4JM J79 RJ4 RJ4J RJ81B UJ11C UJ17V UJ4J UJ81C XJ4J B7S B8S BM7A Champion copper cored center electrode with triple coated shells, this eliminates the need for the use of anti-seize compound during installation by providing the best corrosion protection of any spark plug in the industry. The Champion Copper Plus core with Zirconia enhanced insulator spark plug features a copper core electrode that provides increased conductivity and heat control while delivering good overall wear characteristics. Copper core center electrode allows for accurate control of the plug's heat range, optimizing the plug's performance and adding to the longevity of the spark plug. The spark plug is designed to withstand high operating temperatures. Maintain your chain saw or trimmer's engine performance with the Champion Spark Plug for Chain Saws and Trimmers. For use with chain saws and trimmers, Johnson/Evinrude Outboard Motors 14 mm thread, 0.375" reach Wrench hex: 13/16" hex Sparkplug seat: Gasket MPN: 825 UPC Box: 037551000012 UPC Card: 037551668229 UPC Shop: 037551790753 Model: J4C Purchase is for one spark plug. USA domestic shipments are shipped USPS First Class Mail with Tracking International shipments are shipped USPS First Class International Mail with Tracking