Champion Marine Spark Plug L77JC4 #821 Replaces L4G L77J4 L77JC W250T1 W280S1S Box or Card Purchase is for one spark plug. The spark plug is designed to withstand high temperatures and fits most small-engine brands and models. For use with small marine engines Champion copper plus small engine plugs resist fouling and provide superior corrosion resistance Feature a copper core electrode that provides increased conductivity and heat control while delivering good overall wear characteristics Engineered to exceed OE designs and maximum durability Designed for easy starting Plug Type: L77JC4 Seat Type: Gasket Hex Size: 13/16 Inch (20 mm) Thread Size: 14 mm Plug Reach: 0.5 in (12.7 mm) MPN: 821 UPC:New stock: 0375510006178 or 037551011438 or 037551005109 Old stock: 037551120703 or 03755156620 USA domestic shipments are shipped USPS Ground Advantage Mail with Tracking