I know that this isn't what you are asking but I would really recommend having two holes drilled in the same box and use the same method that "Herbie" on RC used - it is the best way to silence both your overflow and the sump. With only one bulkhead you would probably need a durso-type standpipe but your sump would still boil/hot-tub. I guess the sump will be in the basement anyways but it is something to think about.
Just trying to help.
- Chad
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Returning to the hobby after an eight year absence.
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