Quote:
Originally Posted by mikeyfev1
[*]A single circuit is not expected to hold vacuum over a long duration; there is no need for it.[/LIST]
This second point is critical; to be fully functional a single circuit only needs to hold vacuum long enough that the entire circuit can switch from one state to the other.
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Considering that one circuit is always connected to the reservoir, any lack of vacuum integrity in that circuit will cause a depletion of "stored" vacuum.