Engine Radiator Overflow Expansion Tank Bottle With Cap For Focus MK3 09-12 C-Max S40 V50 C30 C70 MAZDA3 OEM NO.: 5M5H8K218AA+3M5H8100AD Maximum operating temperature: 105℃ or lower Material: Plastic Compatibility: Focus MK3 (2009-2012), C-Max, S40, V50, C30, C70, Mazda3 Installation: No drilling or modifications required Design: Ergonomic and sleek This engine radiator overflow expansion tank bottle with cap is designed to maintain the efficiency of your vehicle's cooling system.It is engineered to hold excess coolant and release pressure as needed, helping prevent overheating and supporting consistent engine performance under various driving conditions. Constructed from plastic, the tank is built to withstand regular use and thermal stress.The design allows for straightforward installation without the need for modifications, making it a direct-fit replacement for select models including Focus MK3 (2009–2012), C-Max, S40, V50, C30, C70, and Mazda3. The tank integrates into the engine bay, combining functional with a clean appearance.Its precise fit stable , while the included cap maintains proper system pressure.This unit serves as a replacement for the expansion tank, supporting cooling system function. Compatibility Clarification: This part is not made by the brand.Mentioned models are for reference only.