"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 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.
Keg Coupler Features:
- Stainless Steel body improves durability and resistance to chemicals
- Stainless Steel handle fork for added strength
- Tin-nickel plated probe is resistant chemicals and won’t chip like chrome
- Short handle is ideal for smaller diameter kegs