Autolite 4063-4PK Copper Resistor Spark Plug, Pack of 4
- Copper-glass seal bonds insulator, terminal post, and center electrode together to provide a tight seal that is 100 percent leak-proof.
- Cold-formed steel shell and precision rolled threads, with one-piece terminal post to add strength.
- Multi-rib insulator reduces danger of "flash-over".
- Resistor reduces radio frequency interference (RFI) and electrode erosion.
- Full copper core electrode provides better performance in all conditions.