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NGK's Standard plugs are constructed for longer life and optimum performance. Trivalent metal plating provides superior anti-corrosion and anti-seizing properties. Corrugated ribs prevent flashover. Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer. Copper core aids in heat removal. Triple seals prevent leakage. BR8HS-10 Blyb Trivalent metal plating provides superior anti-corrosion and anti-seizing properties Corrugated ribs prevent flashover Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer Copper core aids in heat removal Triple seals prevent leakage Used in marine applications PWC 1992 Ultranautics, O/B 2007-1997 Nissan, 2003-1986 Suzuki & 2007-1997 Tohatsu. Plug Specifications: Thread Size: 14mm Hex Size: 13/16" (20.6mm) Reach: 12.7mm (1/2") Seat Type: Gasket Gap: .040" (1.0mm) Heat Range: 8