A spark plug cap for the Citroën DS is a crucial component that protects the spark plug from dirt and moisture. It ensures a proper connection between the spark plug and the ignition coil, enabling efficient combustion of the engine's fuel-air mixture. This is vital for optimal engine performance and prevents possible ignition issues. Made from sturdy materials, this cap offers durability and good thermal insulation. Specifically designed for the classic Citroën DS, it maintains the vehicle's authentic appearance and performance.