1795 2001-2005 6.6L Duramax Diesel hi flow water pumpOnce we developed the first diesel pumps, the customers started calling and asking for the next. We designed an impeller with a larger eye, an increased vane count and a reduced impeller vane clearance to increase flow and prevent overheating for big vehicle that are under a load. It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller color is due to Type II Class II military grade surface coating which protects