Billet Aluminum Belt Water Pump Pulley For BMW E46 E39 E60 E61 Z3 E85 M54 M52tu
Aluminum version of the standard water pump pulley used on M52, M52tu and M54 engines. Not for cars before the 1999 model year. In 1999, BMW updated the M52 engine to M52TU (the "tu" short for technical update).