1、OE Number: The referencing OE number of this radiator coolant reservoir cap are YL8Z 8100 AA, YL8Z8100AA, YL848100AA, molded and designed depend on the original data. 2、Fitment: The engine coolant fluid cap is a replacement for Escape 2001‑2012, replacement for Mariner 2007‑2011, please check the model and year of manufacturing before ordering. 3、Enhanced Cooling Performance: The radiator coolant reservoir cap helps maintain optimal coolant level, ensuring efficient cooling performance. 4、Effective Seal: The cap effectively seals the coolant reservoir, preventing leakage and evaporation of the coolant, and ensuring a properly functioning cooling system. 5、Solid Construction: Made from robust ABS materials, this coolant reservoir cap withstands extensive use and high temperatures, maintaining its longevity and performance.