Copper-glass seal bonded insulator, terminal post, and center electrode provide a tight seal that is 100 percent leak-proof;Multi-rib insulator reduces danger of flash-over to prevent misfires;Full copper core electrode improves heat transfer and optimizes plug life;Copper core center electrode provides higher thermal conductivity;Features high alumina ceramic for high dielectric strength and steel shell for installation robustness

• Autolite 104 Copper Resistor Spark Plug
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Autolite 104 Copper Resistor Spark Plugnobrandname