The Volvo Penta 3856759 6 Pack Spark Plug Kit "RS12YC" is designed to fit models 4.3Gi, 4.3GL, and 4.3GS. Manufactured by Volvo Penta, this spark plug kit ensures high-quality ignition performance for your inboard engine. With a focus on durability and reliability, this kit provides a convenient solution for maintaining your boat's ignition system.