[warthog5]

With the 2 valves it put's the 60gal tank in series with the 80gal and the main air line in the shop.

The air goes from the 80gal in the top of the 60gal and then out the side of the 60gal to the main line.

If I didn't have 2 valves the air would go in the main line from the 80gal and then backup into the 60gal tank.

This stuff is all stationary and hard plumbed.

I dialed down the regulator switch on the 80gal. It is designed for 175psi. I have it set at 150psi because the 60gal tank is not rated that high.