Genuine OEM Volkswagen Power Steering Fluid Reservoir, part number 3D0422371E. This reservoir is designed to store hydraulic fluid for the power steering system, ensuring a continuous supply for smooth steering operation. Constructed from durable plastic and weighing 0.535 kg, it includes a cap for sealing. Using a genuine OEM reservoir ensures proper fluid capacity, material compatibility with power steering fluid, and a secure seal, critical for the longevity and performance of the steering system.