The SEAT Ibiza 6J Coolant Expansion Tank Overflow Bottle is a genuine part made by Seat in Germany. This unit, with a manufacturer part number of 600121407, is designed specifically for the Ibiza 6J model, ensuring a perfect fit and functionality. It comes with a warranty of 30 days from the seller, providing peace of mind for the buyer. The expansion and overflow tank is essential for the cooling system of the vehicle, ensuring optimal performance and longevity of the system.