Description [FAST START-UP] – Bosch patented Duraterm technology enables the glow plug to reach higher temperatures more quickly for fast engine start-up [ANTI-SEIZE DESIGN] – Nickel-plated, rolled threads offer increased strength and prevent seizure [LONGER LIFE] – Twin Viton seals promote longer life by protecting the coils against exhaust gas damage [EASY INSTALLATION] – Bosch Glow Plugs incorporate OE or OE spec connectors for a precise fit and easy installation [MEETS OR EXCEEDS OE SPECS] – As an OE glow plug supplier for many vehicle manufacturers worldwide, Bosch has the technology and experience to ensure all OE replacement glow plugs meet or exceed the original manufacturers specifications Compatible with select Ford vehicles with diesel engine (verify specific fitment details with fit checker above): 1999-05 E-350, 2000-05 E-450, 2002-03 E-550, 1996-99 Econoline Super Duty, 2000-03 Excursion, 1994-97 F Super Duty, 1994-97 F-250 FORD: 1999-03 F-250 Super Duty, 1994-97 F-350, 1999-03 F-350 Super Duty, 1999-03 F-450 Super Duty, 1999-03 F-550 Super Duty, 1994 F59 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.