Dirtbag, 15 PSI would barely get the beer to flow through all the resistance of a 120 Ft coil. The whole jockey box/coil thing really goes against all the draft rules but it's works very well in "most" cases. There's just no way to avoid overcarbonation with a 120ft coil. But that's not usually a problem because the only reason to use a coil that length is if you plan to pour a lot of beer or want to pour off a room temp keg in less than 24 hours.
Tapman, even though I start at about 25 PSI, by the time I'm near the end of the keg, I've adjusted the pressure up to about 30-33 PSI.
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