Shanks are the internal workings in most draft systems. They are a shaft that sticks throught the surface of a kegerator or a wall which a faucet attaches to. On the other side, a beer nut, tailpiece and neoprene washer are needed in order to connect liquid line to the setup, enabling the beer to flow! Great fermentations has a number of shanks, tailpieces, and other accessories for building your ultimate draft system, and a knowledgable staff who will be happy to help you figure out exactly what you'll need!