These repair parts and kits maintain circulating pumps. Bearing assemblies transfer the power generated by the motor to the impeller. Motors run on alternating current (AC) to power the pump. The bearing assembly and motor are replaceable in a 3-piece circulating pump. Impellers are the rotating mechanism in a pump that move fluid through the system using centrifugal force. Seal kits and gaskets keep the circulating pump's motor and bearing assembly dry by preventing water from exiting the pump body. In most cases, these replacement parts should match the brand, series, and manufacturer model number of the pump.