Bosch 250403008 80050 Glow Plug Inconel 601 Glow Tube Material Withstands Extreme Operating Temperatures and is Corrosion and Vibration Resistant for Long Service Life; BOSCH 80050 Glow Plug, Pack of 1 Conical Seal Provides Positive Sealing to the Combustion Chamber OE Connectors Provide a Precise Fit and Easy Installation Nickel Plated Rolled Threads Increase Strength and Prevent Seizure Fine-Grained Ceramic Insulating Powder Provides Superior Electrical Insulation of the Heating and Regulating Coils and High Thermal Conductivity in the Transfer of Heat from Heating Coil to Glow Tube