Quote:
Originally posted by euroreef
The "Rotor" is an assembly which includes: the magnet with the bearing(s) inserted, protective casing, and the head, The impeller mounted to the rotor head along with the shaft and mounting bushings make the impeller "Assembly".
What we have done is re-design the rotor.
Hope that helps 
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I asked this a couple of days ago and haven't heard back. Are these new rotors that make the pump quieter going to be offered for free from people who own these pumps?