[Richard]

Brilliant idea on plumbing in an air chuck to the external drain. Brilliant !!!!!!

Btw, as a quick sanity check, all you have to do is connect the drains from the two tanks and open the valves. If you used tubing for the drains, one double ended push on connector and you will know.

And if it doesn’t air up, you have traced the problem to the tank itself.

I can’t keep up with all you do. Did you refurb those two tanks? And if you did, did you happen to treat the inside with anything? And is the inlet on the bottom? I know, I know, it’s far fetched. Unicorns not even zebras.