A 2in. hole takes a 1 1/2in. bulkhead, which takes 1 1/4in. pipe. Thats the standard that Jayson uses.
I had said my Mak4 currently drives two overflows of that size, so one of the same is pushing it, unless, the higher head cuts it down. Like I also mentioned, you can run a bleeder into your sump though.
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Doug
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