Paul, Ty is correct. I went from my 1 1/4 t'd off into a 1" and t'd that off to 3/4 for my pumps. If you want to make your life a whole lot easier, I would go with the Simer BW85 reversable pumps, they don't cost much more than the pumps your planning on using. When I used aerator pumps, my 1100 was just as fast as my 2000.
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