Genuine OEM Audi Reducing Agent Tank Rubber Bush, part number 4M0201840. This rubber bush is designed to cushion and support the reducing agent (AdBlue/DEF) tank, effectively absorbing vibrations and ensuring its secure mounting within the vehicle's emissions system. It is located as a mounting point for the reducing agent tank. Weighing 0.01 kg with dimensions of 0.03m x 0.03m x 0.025m, this small but crucial component provides essential isolation. Choosing a genuine OEM rubber bush guarantees the correct material composition and durometer for effective vibration dampening and long-term durability in its specific application.