Description:

Densos standard plugs have always offered a patented U-groove ground electrode producing for a larger, hotter spark. Copper core for better thermal conductivity. Machine rolled threads to reduce cross-threading and seizing. The plug insulator is constructed of purified alumina powder for extreme stress with 5 ribs to prevent flashover. Model # 4009 Features: Denso # 4009 Denso Traditional Nickel Spark Plug NOTE: Plug has threaded terminal stud and does not contain terminal nut. If terminal nut is needed, order part#067606-0051 U-Groove Ground Electrode.