The Genuine BMW Tail Light Housing Seal - 63217186766 is a rubber gasket designed to seal the tail light housing on BMW vehicles. It is a genuine OEM (original equipment manufacturer) part made specifically for BMW models. This seal helps to prevent water, dust, and other debris from entering the tail light housing, which can cause damage to the light bulbs and electrical components. It is an essential component for maintaining the integrity and functionality of the tail lights on BMW vehicles.