URO MI1117843 Coolant Expansion Tank Cap - Mini Cooper

The URO MI1117843 Coolant Expansion Tank Cap, also called a coolant reservoir cap or coolant recovery bottle cap, seals the expansion tank in the engine cooling system.

Key Points:

• Closes the coolant expansion tank and keeps coolant in and dirt out
• Helps the cooling system hold pressure, which raises the coolant boiling point and helps prevent overheating
• Replaces a worn, damaged or missing cap

A cap that no longer seals properly can let pressure and coolant escape, so replacing it helps keep the cooling system working as designed.