Motorcraft Glow Plug is designed to heat up the air in the combustion chamber so that the diesel fuel will be ignited more quickly. It is equipped with regulating and heating coils for fast heat-up of the glow tube. This glow plug resists corrosion and vibration for long service life. It has threads designed for strength and plated to prevent seizure as well as conical seat to ensure a positive seal with the combustion chamber..