Jabsco 6400-1051 1.25" NPT ports, Bronze ball bearing pump, substitute for Caterpillar engine pump. The ideal solution for raw-water marine engine cooling. Designed specifically for engine cooling applications. Corrosion resistant bronze housing and shaft with permanently lubricated ball bearings. Self-priming with the ability to operate in either direction at variable speeds. Uses flexible impellers with a removable end cover for easy service. Service Kit JAB-90062-0001