Champion® QL77JC4 Marine Inboard/Stern Drives Spark Plug. It is designed for Mercruiser & OMC. This spark plug is made of high-quality materials that are durable and long-lasting. It is also easy to install and maintain.

• For Mercruiser & OMC.
• Champion Copper Plus
• Dependable Performance as the OE replacement spark plug
• Provides long life with the copper core center electrode
• Allows accurate control of heat range
• Optimize performance and longevity
• RFI & EMI suppression to not interfere with modern ignition systems