This is a spark plug and it is found in various lawn equipment. If your engine is not starting or running poorly, you may need to replace the spark plug. This part is a RJ9LM. Meaning, it is a resistor type with a 14mm shell design, 3/8-inch reach, and 13/16-inch hex. The heat range is 9 for automotive, small engine, and ordnance applications. The LM indicates 14mm (special for lawn mowers). Before making this installation make sure to drain fuel from the tank and remove the old spark plug.
Manufacturer Part Number: 796112S