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Drilling a 75gal

482 Views 5 Replies 4 Participants Last post by  mbike1
Hi all I need to know what hole size I need to drill a 75 gal for a overflow. 1' 3/4"??? What size would give me the most plumbing options.


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When you are first setting up a tank it is far easier to drill 2 holes for sump returns and not really use the full potential of either. Normally 1" drain are rated for 600gph each. I have found that I can consitantly push 1000gph through mine with a durso standpipe. If I were to do it again I would put in 2 and have to throttle it back a little rather than change your mind later and want a extra one. I would also use 1" because of all of the parts that are available for it which is a 1.75" hole.

Good Luck Randy
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