D Style Keg Coupler 

The D Style keg coupler is the most commonly used style of coupler in North America, otherwise referred to as the American Sankey. 

Used by the major breweries such as Anheuser-Busch, Molson-Coors, and Labatt, it is also used by many craft breweries!

This keg coupler is made from 304 stainless steel which improves its durability and resistance to chemicals. It has a 3/8" outer diameter barb to fit a 5/16" inner diameter gas hose, and a pressure relief valve that releases at 55-65 PSI.