Champion L92LCC Marine Spark PlugsChampion marine spark plugs are quality OEM replacements. The Champion RH12 Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads. Resists fouling; Superior corrosion resistance; Dependable and proven performance; Increased conductivity and heat control for good overall wear; Champion Spark Plug # 923Application: Mercury Marine; 2 cyl. 2-Stroke 15 HP; 2 cyl. 2-Stroke 9.9 HP; 2 cyl. 2-Stroke 6 HP; 2 cyl. 8 HP; 15 Sea Pro 2 cyl. 15 HP; Mariner; 2 cyl. 15 HP; 2 cyl. 8 HP; 2-Stroke 6 HP; 9.9 2 cyl. 9.9 HP;