The Genuine Mercedes Windshield Washer Reservoir Adapter (part number 2208690108) is a component used in the windshield washer system of Mercedes vehicles. This adapter connects the washer reservoir to the washer pump, allowing for proper fluid flow and distribution onto the windshield. It is a genuine OEM part manufactured by Mercedes and is designed to fit specific models of Mercedes vehicles. This adapter is essential for the proper functioning of the windshield washer system and ensures that the windshield can be effectively cleaned while driving.