ACDelco offers water pumps in aluminum or cast iron to match vehicle manufacture design. The all-aluminum casting is pressure-tested for leaks prior to pump assembly. Additional leak testing on the assembly line helps eliminate the possibility of leakage or pump failure, offering a high degree of dependability. Other Features: *Uniform wall sections and smooth coolant-flow cavities *Heat-treated, cast-iron or steel-stamped impellers *Precisely positioned fan hub *Quality Bearings