This is a genuine OEM sourced part which is specially made for use with a variety of lawn and garden equipment. A spark plug delivers electric current from the ignition system to the internal combustion engine. Unfortunately, over time spark plugs will become dirty or fouled eventually requiring a replacement to maintain peak performance....Read more Note, you should gap your spark plug according to the owners manual of the outdoor product you have. Keep in mind this high-quality spark plug is made of durable materials and is sold individually.