Bosch 0250201038 Glow Plug Bosch patented Duraterm technology* Regulating coil controls current draw for rapid heat-up of heating coil Heating coil provides rapid heat-up of the glow tube and quick start-up Glow tube material (Iconel 601) resists corrosion and vibration for long service life Fine-grained ceramic insulating powder provides superior electrical insulation and high thermal conductivity