NGK (6993) BKR6EKU Standard Spark Plug, Pack of 1 Designed to operate over a much wider heat range than ordinary plugs Resists carbon buildup and pre-ignition High alumina ceramics for better heat transfer and electrical insulation Solid copper core and nickel tipped electrode provide a longer plus life Patented triple gasket sealing process eliminates the possibility of combustion gas leakage Solid copper core for greater spark, superior heat dissipation and conductivity Longer insulator nose prevents fouling Corrugated ribs on insulator prevents flashover Dual ground electrodes for more consistent spark Triple gasket seal eliminates combustion gas leakage and the zinc dipped shell prevents corrosion