The G408 is a coupler that is compatible with European "U" system kegs. The most popular beers that work with this coupler are Guinness and Harp. The G408 features a heavy duty ergonomic lever handle. This keg tap also features a 55-psi pressure relief valve and a nickel-plated forged brass body. To tap a keg all you have to do is squeeze the handles together and then push down on the lever handle to properly couple the keg.