- Every Copper Spark Plug has a full copper core electrode which provides higher thermal conductivity for better performance in all conditions
- All Autolite spark plugs are Leak proof and come with a heat fused internal seal for long lasting durability
- These replacement spark plugs have a copper-glass seal which bonds the insulator and the terminal post center electrode together
- The Autolite copper automotive replacement spark plug are guaranteed to deliver quick starts, better fuel economy and smooth acceleration
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