The product is a new old stock (NOS) coolant reservoir expansion tank with a sensor included, designed to fit 2004-2007 BMW E60 E61 models. It features a bolt-on mounting style and is made of plastic material. The tank has been 100% leak tested and does not require drilling or modifications for installation. It is a genuine OEM part manufactured in China, carrying the manufacturer part numbers 17137519219 and 17137542986. This cool ant expansion tank is a reliable replacement part that meets the standards of quality required for car and truck parts. Exact item is shown. New open box without the original packaging, which was damaged in transit. Includes the cap shown. No returns if installed. Made in China. Please review our business policies in our store for information regarding returns, shipping and warranties.