Specification: (1)Multi-ribs of insulator eliminate flashover. (2)Insulator made of 95% pure alumina,strong resistant to heat shock,great mechanic and electric features,super insulation. (3)Nickel plated housing prevents oxidation and corrosion,heat crimping process ensures absolute gas-tight fit. (4)Inner sealing with conductive glass ensures a fine conductivity and sealing. (5)Multi-layer gasket is elastically strong,and reliable in sealing. (6)copper core electrode prevents oxidation and corrosion,good electric and heat conductivity,long spark plug service life.