Quote:
Originally Posted by hillegom
how are bulkheads measured? Is it the ID? or the size of the hole in the glass?
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Depends on the bulkhead. For slip bulkheads, the ID will be 1-1/4" but for thread it will be 1" on the female side and 1-1/4 on the male side.
It should say right on the bulkhead though.
The hole in the glass will be a bit bigger than the bulkhead size.