MERCURY SPARKPLUG by NGK

10mm Thread, 12.7mm (1/2") Reach, 5/8" (16mm) Hex Size, Gasket Seat, Resistor, Stud Terminal, .027" (0.7mm) Gap, Heat Range 6. NOTE: Does not include terminal nut, if necessary, order part #067606-0051

NGK traditional plugs are constructed for longer life and optimum performance. Corrugated ribs prevent flashover. NGK uses only the purest alumina silicate in its ceramic insulator which give all NGK plugs greater strength and better heat transfer. Copper cored and triple sealed to further aid in heat removal and prevent interior leakage.

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