The O-ring for the steering box or gearbox of a Citroën ID/DS is a crucial component ensuring a leak-proof seal in the car's hydraulic system. This O-ring prevents hydraulic fluid leaks, essential for the optimal operation of both the steering mechanism and the gearbox. Made from high-quality materials, it offers excellent resistance to wear and pressure, thereby extending the lifespan of the components it is designed for. It's an essential piece for the maintenance schedule of your classic Citroën vehicle.