NGK SPARK PLUGS Spark Plug — Thread reach 19.1 mm (3/4"), thread size 12 mm, hex 16 mm (5/8"), spark gap 0.9 mm, heat range 6
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Durable spark plug with trivalent plating, alumina-silicate ceramic insulator, triple seals, corrugated ribs, and a copper core for reliable ignition and heat control.