The most common and simplest system is the Direct Draw system.
This system is used when the keg of beer is located within a few feet of the beer dispensing faucet.
The applied CO2 gauge pressure will be set at between 13 - 15 PSI (Pounds per Square Inch) depending on the type of beer, storage temperature and elevation.
The beer tubing will consist of approximately five feet of 3/16 ID vinyl beer tubing. This will vary depending on the applied gauge pressure. (View the article titled, “Balancing Direct Draw Beer Systems”.
! Most commercial keg boxes, home bars, and refrigerator conversions use this type of dispensing system configuration.