Ball-lock and pin-lock are the two type of connectors (plugs) that are used to attach to the kegs. Cornelius is a keg manufacturer (there are others, but people tend to call all of them cornies). Most cornies are built with ball-type connectors. Pepsi kegs use ball-locks. Ball connectors for gas and liquid are slightly different in size. Some people think this is a bad thing. Coke uses pin-lock connectors. IMO pin-locks are a pain. They are also less common.
You can pick either type, but stick with it. Never buy any kegging equipment that doesn't explicitly state pin or ball.
To make things even more fun, there are five gallon 'cornies' out there that use the commercial sankey connector.
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Last edited by david_42; 02-07-2006 at 02:00 AM.