The Genuine BMW Rear Window Key Button Gasket - 61318372075 is a small rubber seal designed to fit around the key button on the rear window of a BMW vehicle. This gasket helps to provide a tight seal and prevent water or debris from entering the key button mechanism. It is a genuine BMW product, ensuring high quality and proper fit for your vehicle. This gasket is an essential component for maintaining the functionality and longevity of your BMW's rear window key button.