With a long history of diesel fuel injection expertise and innovation, Bosch leads the way in glow plug technology with its patented Duraterm dual control coil design. This technology utilizes a self-regulating system that reduces glow wait time by more than 50%. The patented dual control regulating and heating coil system effectively directs current draw, enabling the glow plug to reach higher temperatures more quickly for faster engine start-up. For vehicles with a post-glow control system, this advanced technology results in a post-glow heating phase which allows for more efficient overall engine performance. Enhanced design features include: nickel-plated, rolled threads for increased strength and seizure prevention, twin Viton seals that promote longer life by protecting the coils against exhaust gas damage, and OE or OE spec connectors for a precise fit and easy installation.