The Genuine BMW Expansion Tank Mounting Clip - 17111723580 is a small, plastic clip that is used to secure the expansion tank in place on BMW vehicles. It is an essential component in the cooling system, as it helps to keep the expansion tank securely attached to the vehicle's body. This clip is designed specifically for use in BMW vehicles and is made from high-quality materials to ensure durability and longevity. It is an original equipment manufacturer (OEM) part, meaning it is made by the same company that produces the vehicle. This ensures a perfect fit and reliable performance. The Genuine BMW Expansion Tank Mounting Clip - 17111723580 is an important part of the cooling system that helps to maintain the proper functioning of the engine.