Jabsco 7420-1001 Bronze ball bearing pump, substitute for Sherwood Caterpillar engine pump. 1.25" NPT ports. 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.