Autolite Marine Spark Plug manufacturer part number 2645 is designed for select Evinrude Johnson Mariner Mercury Marine and Outboard Motors. All Autolite Marine Spark Plugs are premium marine spark plugs engineered to resist corrosion in fresh and salt water applications. These plugs feature a copper core center electrode preventing pre-ignition. Autolite is the leading supplier of spark plugs; offering the best alternative to OE spark plugs providing OE form fit and function. If you take care of your engine once a year it will take care of you all season long.