Description:

Radiator Expansion Tank Cap and Coolant Reservoir Cap Cover designed for specific BMW models to maintain proper cooling system pressure and prevent engine overheating.

• Compatible Vehicles: BMW 1 Series M 2011, 128i 2008 to 2013, 135i 2008 to 2013, 228i 2014 to 2016
• Replacement Part Numbers: 17117639020, 17117521071, 17117639021, 17137516004
• Pressure Rating: 1.4bar or 140 KPa
• Pressure Regulation: Acts as a regulating valve to prevent coolant boiling and improve heat transfer efficiency
• Problem Resolution: Fixes coolant leaks, engine temperature warnings, and physical cap deterioration such as cracked seals
• Installation: Direct fit replacement requiring no modifications or special tools
• Included Components: 1x Coolant Reservoir Cap