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

A coupler in a draft beer system serves a crucial function by connecting the keg to the dispensing system. This device allows the beer to flow from the keg to the tap, facilitating the pour of draft beer. When a coupler is engaged, it introduces gas (usually carbon dioxide or a blend) into the keg, which pushes the beer out of the keg and into the delivery line, ensuring that the beer can be served properly in a controlled manner.

In the draft beer system, the coupler is essential for maintaining the integrity of the draft setup, ensuring the right pressure for serving and preventing contamination. Understanding how a coupler works is vital for anyone involved in serving draft beer, as it directly impacts the quality and freshness of the beer being served.