Sorry to take so long in replying. The restriction in the 2nd floor tower is 3/16" I.D. stainless I believe the same i true for the first floor.
We dispense, mostly, from 5 ukbbl serving tanks. Sometimes we do run off a keg or two depending on the situation.
I get the inkling that splitting the lines after the beer pump, as we do, causes the issues duringtimes of high volume. Since at that point we can't individualy tune each line.
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