Spark plug E6TC The structure:1.Multi-ribs of insulator eliminate flashover; 2.Insulator made of 95% pure alumina,strong resisant to heat shock,great mechanic and electric features,super insulation; 3.Nickel plated housing prevents oxidation and corrosionm heat crimping process ensure abs-olutegastight fit; 4.Inner sealing with conductive glass ensure a fine conductivity and sealing ; 5.Multi-layer gaskets are elasticy strong,and reliable in sealing; 6.Copper core electrode prevents oxidation and corrosion,good electric and heat conductivity,long spark plug service life. Serial NumberSize(mm)Reach(mm)Hex(mm)Gap(mm)VersionNGKBOSCHE6CM14*1.2512.720.60.8standardB5HSW8ACE7CM14*1.2512.720.60.8standardB6HSW7ACE8CM14*1.2512.720.60.8standardB7HSW6ACE6TCM14*1.2512.720.60.8projectiveBP5HSW8BCE7TCM14*1.2512.720.60.8projectiveBP6HSW7BCE8TCM14*1.2512.720.60.8projectiveBP7HSW6BCE6RTCM14*1.2512.720.60.8projective&resistorBPR5HSWR8BCE7RTCM14*1.2512.720.60.8projective&resistorBPR6HSWR7BCE8RTCM14*1.2512.720.60.8projective&resistorBPR7HSWR6BC