Large impeller higher capacity water pump with top quality die cast body. Fitted with a PPS, glass filled plastic impeller as used by Jaguar and Aston Martin it reduces weight on the bearing loading and with a triple lip seal gives a better controlled flow rate through the rev range. The pump is about 130 gramms lighter and has the rolled edge gasket facing evolved by rover for better sealing. Tested with coolant pumping at 10,000 rpm with no detriment to the PPS impeller this larger impeller pump moved more controlled coolant than the originals. These pumps have the same aluminium housing and the same deep impeller as the standard items, the only difference is that the bypass adapter has been deleted. This means that if you are running without a bypass hose you don't need to plug it, therefore one less possible leak.