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Not sure if I read that correctly... If your holes in the overflows are 2", your required bulkheads will actually be smaller. That said, I would use all four bulkheads for drains with that amount of flow, or at least set up the ones you don't plan to use as emergency stand pipes rather than capping them off.
You should install ball or gate valve's before and after the return pump along with unions to allow the pump to be removed/serviced, so you don't make a mess or drain your sump.
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Mike
Have you ever looked around at the group of people you are in and thought, "If the Zombie Apocalypse happens right now, this is what I have to work with."
Current Tank Info: 140.5gal. goldfish bowl
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