1665-b 1997-2009 Ford F-150 E-150 E-250 255/4.2L water pumpGot a Hot F 150 or E 150? We designed a impeller with an increased vane count and a reduced impeller vane clearance to take care of the problem. 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 against corrosive fluids. FlowKooler introduced the first hi flow pumps and continues to improve impeller design. Why is increased flow so