Pick the bulkhead first then decide on the hole size ... don't get a hole drilled before having the bulkhead you're going to use. It's a pain to change a hole size after the fact. You can always use bushings to step down the pipe size if it's too big. My advice is go big (1.5") for a drain to the sump.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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