I can see a real problem (or can't see the safeguard in your picture)
In your last image, you show a CO2 manifold with (I assume) no non-return valves between kegs.
For those unaware of the possible issues, when the CO2 runs-out without you knowing and the temperature of the carbonated product rises, sticky substance can be forced out of the keg into the CO2 lines to cross-contaminate them and the other kegs and could clog-up the isolation valves and worse, the regulator diaphragm if it goes far enough.
A real PIA to rectify and leaving you wishing you had installed the in-line non return valves from each keg.
I got mine from Lancer Pacific.
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