1、OEM Number: Coolant expansion tank replace part number are BE21 871, 1717053, 8V618K218AE, CV6Z8A080A, DV618K218AA, 8V618K218AD, 2140225, 1708512. 2、Applicable Models: Reservoir tank is replacement for C‑Max MKII 2010‑2020, replacement for Focus MKIII 2010‑2020, replacement for Grand C‑Max MKII 2010‑2020, etc. 3、Efficient Cooling: The radiator coolant expansion water bottle helps maintain optimal operating temperature by efficiently dissipating heat. 4、Long Lasting: The tank is designed for durability, capable of withstanding extreme temperature fluctuations without aging or cracking. 5、Reliable Performance: The lid ensures a proper seal, preventing water evaporation and maintaining consistent cooling performance.