D System - Keg Coupler - Tap w/ White Lever Handle "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. Visit our beer system listing for an expanded listing of beers that use the "D" system valve. Do all brands of beers use the same keg tapping equipment? The keg coupler connects to the keg valve, "tapping" the keg. Both the gas line from the CO2 tank / regulator and the beer hose to the beer faucet attach to the coupler. Beer Keg Tap Features: Chrome plated probe Chrome plated forged brass body Specifications: SystemD Handle ColorWhite Handle StyleLever ProbeNon-rotating Gas Port3/8" O.D. Barb (To fit 5/16" I.D. Gas Hose) Beer Port7/8"-14 Thread (U.S. Beer Industry Standard)