What is an MM?
Answer:
That would be a tolerance dimension. That will have nothing to do with whether or not the pump will work for your application.
You will need to get the pump manufacturer and model number so you can get the pump perfomrnace curve to see if it will work. There should be a nameplate somewhere on the pump, if not, might be hard to determine the pumps performance.
Bascially I think your posting a 'troll' question thats designed to be silly & evoke silly respones.
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