The BOSCH 1987301017 is a P21W 12V glow plug, engineered to meet high standards of quality and durability. This glow plug plays a crucial role in the starting process of diesel engines, preheating the combustion chamber to ensure efficient ignition, especially in colder conditions. BOSCH is a trusted name in automotive parts, known for its commitment to innovation and performance. Choosing this glow plug means opting for a component designed for longevity and consistent operation.