Description Reviews MINI Cooper S Coolant Fitting for all R52 Cooper S Convertibles from 2005-2008. & R53 Cooper S from 2002-2006. This part is the T-Connector from the coolant hose to the expansion tank. This fitting can get damaged and break when doing work in the engine bay because it is plastic. The good news is this unit is metal and should not break again for you! This is the only one we sell anymore because of the better design vs. the plastic one.