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The differences I see are that the first one is only tieing the two tanks together with one line and the second drawing is using 3 lines. I normally use two lines. and on the second drawign they are using to psi switches, where as the first drawing is just using one with a relay for each compressor. also how I do it. And in the third drawing it looks like they are showing a schrader valve at each bag for emergency fill. I just put one in the tank. I expect the valves to keep working. It's the compressor/ relay/ pressure switch that I expect to go bad.
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