Quote:
Originally posted by Turbokeu
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BTW, on Johnson-pumps's website they state that the CM-pumps are magnetically driven and the CO-pumps have a mechanical seal between motor and pump, so they should be direct driven.
What do you think about the durability of this seal?
And yes, I definately would put the two caps and a diode between pump and PSU.
I will even try some of those AC RF filters (I have some lying around) and record with an oscilloscope.
CD 
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(I get a kick out of your avatar!)
The CO pumps have a mechanical seal, to seal the shaft from the housing. I don't think it has anything to do with wether or not they're mag drive plus, as flyingass already stated, he took it apart and found brushes.
What he didn't mention though, is if the shaft drives the impeller directly.
I'll throw out a suggestion, maybe stupid, to try to extend the life of the brushes: maybe we can come up with something practical?: spray the rotor's contact area with a silicone lubricant. (never mind the procedure for now).