RMS TD42 Billet Water Pump suits all TD42 Engines for Nissan Patrol GQ and GUTD42 billet water pump upgrade. There are a few others on the market but no real insight as to what they are actually achieving. The standard style pumps suffers quite badly from cavitation through the whole rev range to the point where at higher rpm the flow drops almost to nothing. This causes localised overheating leading to micro boiling and hot spots in your engine. NOTE : Non genuine water pumps seem to suffer far worse than Genuine Nissan water