Thanks Dennis.

Do share with inquiring minds the whys and wherefores and where to git
one...

Why not "join" on the regulated side?

What are these check valves for?

Do I have a check valve on my stock system?

Where are the two tank regulators to be found (a mfg would be handy)?

Is there a system diagram for such a setup?

A pointer to your sources would be most appreciated.

Pensionerd.  two tanks not joined.