Weather a pump is AC or DC is a very arbitrary way of determining open or closed impeller. Iwakis are closed impeller are they not? They are AC are they not? I'm quite confident that the MCP600 is an open impeller pump (I have one right here I would be more than happy to take it out of its loop and look inside). I would not be surprised if the MCP350 was closed impeller (after all, it has such a high head rating) though I have a hard time imagining how to design a closed impeller in a pump without a center inlet. Further more I don't think you could mod a closed impeller pump to have a center inlet. Perhaps bill would care to clarify some of this?
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