This is the original factory replacement of the rotor/impeller assembly for the Rena Filstar XP1 and includes a new shaft and bearing/bushing. The rotor is the magnet part of the motor that spins. Attached to this is the impeller which consists of blades that catch and pump the water out of the filter and back to the tank. Over time the rotor magnet loses magnetic strength and will exhibit trouble starting or the filter will have reduced flow even after cleaning. Replace the unit if your filter exhibits these symptoms or if the impeller blades break or separate from the rotor. If you have the rotor/impeller assembly with bearings at both ends, you can purchase these bearings separately, item 440308-00.
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