Description Inconel 601 Glow Tube Material Withstands Extreme Operating Temperatures and is Corrosion and Vibration Resistant for Long Service Life; BOSCH 80032 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 Bosch Glow Plugs are Designed and Built to Last for Season after Season of Quick, Reliable Start-Ups.