Good info, Phak1.
Looks to me like you can source a tube nut for 3/8 tubing that has 11/16-18 thread. Would that have simplified the connection? Or is there more to it than that?
13/16” inverted flare is for 7/16” tubing which is the stock size. I couldn’t find 7/16” tubing so, I opted to use 3/8” which is readily available. At the time, I couldn't find a 13/16” inverted male flare to 3/8” tube fitting, thus the reason for fabricating one.
If you have a source, please post it so others can benefit from it.
