High output water pump for 1275 A+ engines. No bypass fitting. Fitted with a PPS glass filled plastic impeller, as used by Jaguar and Aston Martin, it reduces weight on the bearing and has a triple lip seal. This pump has a larger impeller, sticking into the block very slightly more than 1/2". Has the rolled edge gasket face developed by Rover for better sealing. Ref: GWP0154HP, GWP187EVO, GWP154.