"D" system is the most common system available in the US, also known as American Sankey. It is used by all the major breweries - Anheuser-Busch, Miller, Molson-Coors and Labatt as well as most craft breweries. The 7485SS keg coupler features a 303 stainless steel body and probe that are resistant to chemicals and won't chip like chrome. The coupler has a lever handle with a stainless steel handle fork for added durability. The short handle is ideal for smaller diameter kegs. To tap a keg, all you have to do is push down on the easy-to-engage handle and pull up to untap.