I'm running an Ampmaster 2100 through an OM 4 way for my closed loop. I have a 2" inlet, but a 1 1/2" would be fine for that pump. I have four 1" returns from the OM. It has a maximum output of 2880 gph at zero head. At approximatley 6' of head it will have the 2000 gph that you want.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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