Why the bushing?
I used both slip-fit and threaded (inside) bulkheads.
For the 2" slip-fit bulkheads, didn't use any bushings, just glued 2" pipe directly into bulkhead.
As for the threaded 1" bulkheads, used 1" TA (threaded to slip adapter) screwed that into the bulkhead then glued 1" pipe into the TA (again no bushing).
fyi: the 1" bulkhead, tank was drilled 1.75"
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