Genuine OEM Volkswagen Steering Expansion Hose O-Ring, part number 7L0422999. This small but vital component creates a fluid-tight seal within the power steering system, specifically for the expansion hose connection. It is designed to prevent leaks at the connection point of the steering expansion hose. Made from a durable elastomer, this O-ring is approximately 1.1 cm in diameter and 0.2 cm thick, with a distinctive greenish-grey colour. Using a genuine OEM O-ring ensures the correct material compound and precise dimensions for optimal sealing performance and resistance to power steering fluid, preventing leaks and maintaining system pressure.