Cicerone Certified Beer Server Practice Exam 2026 - Free Beer Server Practice Questions and Study Guide

The part of a draft system that automatically stops the flow of beer when the keg is empty is called a FOB, or "foam on beer." The FOB is designed to prevent foam from pouring out of the tap by detecting when the beer is no longer flowing. When the keg runs out, the FOB shuts off the flow to maintain the quality of the beer and prevent wasting it.

This component is essential in bar operations because it helps minimize downtime and ensures that patrons receive a consistent quality of beer, as foam can affect the serving quality and customer experience. The FOB works by using a float mechanism, which moves up and down with the level of liquid in the line, allowing for seamless operation and reducing the need for bartenders to manually monitor the keg levels constantly.

Knowing about the FOB is crucial for anyone involved in draft beer service, as it plays a significant role in maintaining the integrity of the beer and the efficiency of service.