"D" system / American Sanke Coupler (Tap) with pull lever. The Pull lever style tap will last much longer than the twist style. This is the most common system available in the US. It is used by all the major breweries - Anheuser-Busch, Miller, Molson-Coors, and Labatt as well as most craft breweries. 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. Includes 5/16 tail piece for CO2 Sanke. Does not include the tail piece, washer and beer nut for attaching beer line. For kegerator, use of 3/16 tail piece is recommended. For Jockey Box use, the 5/16 tail piece is recommended.