Denso FXE20HR11 Iridium Long-Life Spark Plugs 3439-4 PK

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• 100 percent pre-fired to ensure reliable operation
• Copper core center electrode for superior thermal conductivity
• Unique five-rib insulator reduces flashover and decreases voltage loss
• Dual copper and glass seal bonds the center electrode and insulator together for a gas-tight seal.
• Lasts up to three times as long as conventional plugs