Large impeller higher capacity water pump. Fitted with a PPS, glass filled plastic impeller as used by Jaguar and Aston Martin it reduces weight on the bearing loading and has a triple lip seal giving a better controlled flow rate through the rev range.The pump is about 130 gramms lighter and the gasket mating face is the raised rounded type as per airtex and Rover originals on their alloy body pumps. Only for twin point injection cars. This pump is high capacity but without the lug for attaching the alternator.