Here’s a cool article on how draft beer systems work:

In any draft system, you’ve got six main components: cooler, keg, coupler, gas, tubing, and faucet—it can get more complex, but that’s the basic setup. These six pieces all work together in a delicate harmony to ensure that the beer served to you is properly chilled and carbonated, with an appropriate foamy head. Here’s how it all breaks down.

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