Steve, don't know if this helps, but I used holes for 1" bulkheads and stepped it down to 3/4" tubing for the GenX. Schedule-40 1" bulkheads require a 1 - 3/4" hole.
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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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