Cicerone Certified Beer Server Practice Exam

What is the function of a coupler in a draft beer system?

1. To chill the beer

2. To allow gas to flow in and out

3. To sanitize the beer lines

4. To serve beer at the correct pressure

The correct answer is: To allow gas to flow in and out

A coupler is an essential component in a draft beer system, functioning primarily to allow gas to flow in and out of the keg. This process is crucial for two reasons: it permits the introduction of carbon dioxide or nitrogen into the keg to push the beer out while simultaneously allowing for the discharge of gases that result from the beer being dispensed. This balance of pressure is fundamental to ensuring that beer is served without excessive foaming or flatness. The coupler connects the draft system to the keg and is designed to engage with various types of keg fittings, allowing it to tap into the keg securely. When the coupler is activated, it opens the gas and beer pathways, enabling the flow necessary for dispensing the beer while maintaining the freshness and carbonation levels of the beer. While other components of a draft beer system can chill the beer, sanitize the lines, or adjust pressure, the primary role of the coupler is specifically tied to gas regulation in the keg system. This distinction highlights the importance of understanding how each component contributes to the overall functionality of draft beer systems.