NGK 6668 standard spark plugs standard spark plugs boast a unique copper core and exclusive electrode design to ensure faster starts, improved engine performance, and extended engine life. Considering these advantages, it's no wonder NGK is the most trusted spark plug brand by boaters and automotive operators.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.