"Jim Wilkins" wrote in message ...

"Gerry" wrote in message ...

In order to draw compressed air from the upper level of my inverted
propane cylinder storage tank; I bazed a half coupling into the inner
end of a reducing bushing (I don't have a welder) and inserted the
smaller pipe through a 3/4" "T" and nipple in the threaded boss. The
branch of the "T" serves as inlet and drain.

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Something like this, in effect?
https://www.zoro.com/nibco-2-x-34-x-...x2/i/G1806664/

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I vaguely remember cobbling up a fitting that let compressed air into and
oil out of a tank that had only one opening, back before I had a lathe. I
may have tapped the small end from the inside and cut the two pipes running
into it short enough to not meet.
https://www.buyfittingsonline.com/pi...eable-iron-ul/