MINI Factory replacement Radiator Cap. This it the cap for adding engine antifreeze or coolant located at the left end (drivers side on US MINIs) of the cylinder head.
Fits the following Cooper (non-S) models:
2002-2006 R50 MINI Cooper Hatchback
2005-2008 R52 MINI Cooper Convertible
For the Cooper S models, see NME7664.