You can also get them from mops.ca, something like $15-20 last time I checked there.
BTW, you're correct in that you need a 1-3/4" hole for a 1" bulkhead. (One caveat: not if you're using schedule-80 bulkheads as they have a thicker wall thickness. But the "regular" bulkheads we normally use are schedule-40.)
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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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