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These new kegs are ball lock but, if you got your kegging system from us, you could still make it work with your exisiting lines because we ship our kits with swivel nuts on the line, allowing our customers to unscrew one set of disconnects and screw on another. If your system is a pin lock, you could add this: http://stores.kegconnection.com/Detail.bok?no=13 ($10.95) and be able to switch the disconnects on your lines.