Genuine OEM Audi A/C receiver drier, part number 4E0820189M. This component is responsible for removing moisture and filtering contaminants from the air conditioning refrigerant circuit. It protects the compressor from damage and ensures the efficiency of the entire climate control system. Genuine OEM receiver driers are built to exact pressure specifications and contain the correct desiccant volume to ensure long-term system reliability and prevent internal corrosion.