Genuine OEM Volkswagen A/C Receiver-Drier Insert, part number 4M0298403. This critical component is designed to be inserted into the air conditioning system's receiver-drier or condenser. Its primary function is to absorb moisture and filter out contaminants from the refrigerant, preventing corrosion, ice formation, and damage to other A/C components. Genuine OEM inserts ensure the correct desiccant material and filtration efficiency, vital for maintaining optimal A/C performance and system longevity.