Autolite 25 Copper Resistor Spark Plug - pack of 1
- 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
- Mixture of nickel and copper-glass seal that bonds the insulator, terminal post and center electrode together, assuring full voltage
- Chromium-nickel alloy ground electrode resists gap erosion