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I have a Mak4 sitting in the garage too.
I'm considering using the smaller 'big' pump for the main pump and the Mak4 for the closed loop.
I hate the idea of putting ball valves on pumps to restrict flow. It always makes me feel wasteful.
I'll install everything as it sits and we'll see how bad it really is. Then I can tear the big pump out if it's too ridiculous.
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