A System - Commonly referred to as the German Slider because it slides onto the valve face. Used by breweries such as - Hoegaarden, Paulaner, Spaten, and Warsteiner.
Similar to the standard European sankey keg coupler, the only real difference is the tip that pierces the spear in the keg is shorter.
G System - This system gets its name from the English developer, Grundy. The valve face can be thought of as a circle with three sides cut off. Used by breweries such as - Bass, Boddingtions, Caffreys and Anchor Steam (50 liter kegs)
Brand new industry standard Sankey type coupler.
U Type, Also known as the UEC or Deep Sankey. - This system takes its name from the English manufacturer UEC.