Coolant Recovery Overflow Reservoir Tank with Cap & Bracket for 5 Series F07 F10 F11 520i 528i 17138614293 17117639020 This coolant recovery overflow reservoir tank is designed to fit specific vehicle models including F07, F10, and F11 series.It includes a cap and mounting bracket for complete installation.The unit functions as a holding container for excess coolant expelled from the radiator during engine temperature changes, allowing it to be drawn back into the cooling system as the engine cools.Constructed to maintain system pressure and prevent air entry, it supports consistent coolant levels and efficient thermal management.Designed for direct replacement, it connects to existing hoses and fits in the location without modification.