Features: 1) Multi-ribs of insulator eliminate flashover 2) Insulator made of 95% pure alumina, strong resistance to heat shock, great mechanical and electric features, super insulation 3) Nickel plated housing prevents oxidation and corrosion, heat crimping process ensures absolute air tight fit 4) Multi-layer gaskets have strong elasticity and reliable in sealing 5) Copper core electrode prevents oxidization and corrosion, good electric and heat conductivity, long spark plug service life