A brand new replacement waterpump for your N54 engined vehicle. If your vehicle is pre-2010 it's likely that your car features an older style waterpump that is prone to failure. This is the latest part number waterpump used in the BMW 1M, Z4 35is and N55 engined vehicles. Highly recommend to replace the thermostat at the same time. The aluminium screws used to mount the waterpump are 'one-time' use only and it's recommended to replace these (3) at the same time.