Swims favorite glass supplier has two styles of condensors that they have a 45/50 joint for, although Swim believes he could special order any style with that joint size.

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The true danger is when liberty is nibbled away, for expedients.  (Edmund Burke)

Really large columns are usually flanged instead of tapered stopper.  They do make some in 45/50 but they are only offered by a few companies, special order, and there is paperwork.  Curiously the paperwork is not the DEA it is the BATF.

Edit: Damn it someone else always has better sources