This coolant recovery expansion tank is designed to fit Q7 4L models (2006–2015) requiring 7L0121407C.It is engineered for performance in automotive cooling systems.Compatible with vehicles bearing chassis codes 7LA, 7L6, 7L7, 7P5, and 9PA, this unit serves as a direct replacement that aligns with design standards for proper fit and function.The tank collects excess coolant from the radiator and returns it to the system as it cools, helping maintain consistent pressure and temperature levels.Installation is designed to be straightforward without requiring modifications.Verify your vehicle's or consult your owner's manual before installation.