Champion RD16 Marine Spark PlugThe Champion RD16 Marine Spark plug is backed by global engineering. This plug is designed with precious metals, FISS, and Hot Lock designs to withstand today's high-temperature and high-load service environments. Designed for high compression and aggressive environments; Manufactured for long-lasting durability; Backed by global engineering from Federal-Mogul; Superior performance and long lasting durability; Champion Spark Plug # 541Application: Evinrude; Standard ignition 9.7 HP; Johnson; Standard ignition 9.7 HP; Volvo Penta; C10; C23; C5;