Description Reviews MINI Cooper Coolant Fitting for all R50 Coopers from 2002-2006. This part is the bleed screw for the heating system in the back. If you have to bleed the system or change out a cooling hose, or even doing a clutch, this fitting can get damaged and break. The original one was plastic and the bleed passage between the two lines can twist and will crack if it's brittle. The good news is this unit is aluminum and should not break again for you! This is the only one we sell anymore because of the better design vs. the plastic one.