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FOB Detectors (Foam-on-Beer Detectors)
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FOB Detectors — Stop Wasted Beer When a Keg Kicks
On a long draw system, when a keg blows, the beer line fills with foam before the next keg takes over. Without a FOB detector, that foam has to be purged — wasting a full line's worth of beer every single keg change. On a busy bar with multiple long draw lines, that adds up fast.
How a FOB Works
A Foam-on-Beer (FOB) detector is installed in the walk-in cooler, inline between the coupler and the trunk line. When the keg kicks and foam enters the FOB chamber, a float drops and automatically shuts off beer flow. The line stays full of beer — not foam. When the new keg is tapped, you reset the FOB and pour immediately, with no purge required.
The ROI Is Real
A standard long draw line holds 1–2 pints of beer between the keg and the faucet
Without a FOB, that beer is wasted as foam on every keg change
A busy bar changing 5–10 kegs per week can recover hundreds of dollars in product annually per line
Most FOBs pay for themselves within weeks of installation
Run the math: Use the draft beer profit margin calculator to estimate how many sellable pints foam waste is costing per keg, per month, and per year before choosing a FOB setup.
What We Carry
Pacific FOB detectors — the industry standard; durable, easy to reset, widely compatible
Mounting brackets & hardware — for clean walk-in cooler installations
FOB detectors are required on all properly built long draw systems. If your system doesn't have them, it should.
FOB Detector FAQ
Do I need a FOB detector on a direct draw kegerator?
Less critical, but still useful — on a short direct-draw run the wasted-beer volume from a keg change is small since the line itself is short. FOBs earn their keep most clearly on long draw systems, where a kicked keg means purging a much longer line full of beer.
How do I reset a FOB after a keg change?
Most Pacific-style FOBs reset with a simple lever or button on the unit once the new keg is tapped and pressurized — no tools needed. If it won't reset, check that the new keg is actually seated and pressurized before assuming the FOB itself has failed.
