High-output water pump for large bore engines, 1275cc and larger. 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: GWP0134HP, GWP134EVO, GWP134, GWP134HP.