I haven't seen a single piece adapter that would allow you to do it but you could either get a glass blower to make you one or with a couple keck clips you could make one with a 45 degree 14 male to 18 female and 18 to 18, 90 degree adapter.
Well.. u need 45 degree angled male to male adapter..I have one from Calen's set of gnomes it was originally for my gnome dome now i use for the same purpose u want..
Edit:
Sry didn't saw the answers , have to refresh pages more often
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