I installed a gauge on my system yesterday. With nothing connected to the end of the T following the gauge, it read zero. Holding my thumb over the end of the fitting I got a max reading of 3 pounds. I connected it to the line to the diffuser and the gauge hardly moved, still reading very near zero. I am running two 9 inch diffuser in series about four feet apart. The one on the end is boiling the water while the first one is just sending up very small bubbles.
Anything that can be learned from this besides I shouldn't have the diffusers running in series?
