I want to say a big thank you to Bruce Bergman. I finally fixed an annoying air leak in my compressor. It was leaking air in the connection of tank to the pressure relay switch (that turns motor on and off). It could not be tightened because if I tightened it on one side, it would unscrew from another side, and it was leaking on both sides.
So, today I cut it with a angle grinder, and replaced with 1/4" fittings and 3/8" pipe union.
It seems to not leak anymore.
I will be very happy if that indeed is be the case, since this way I could leave the 80 gallon compressor on all the time, with air ready, and it would not turn on every few hours.
Thank you, Brice, for inspiring me to do that.
i