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Drilling a 75gal

481 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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I'm using a a Mag 9 as my main system pump and at head height i'm at something like 800gph. I'd like to put in more than I need as I would like to use more system pump for my circulation and have less aux pwr heads. Does 1" sound like it will be enough? 1" = 1.75" bulkhead hole size correct?
Thanks everyone for the advice looks like I'll go with 1" and maybe get one in each corner for more potential later on.
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