Which type of keg nearly exclusively uses D couplers?

The type of keg that nearly exclusively uses D couplers is associated with American ales. D couplers are the standard for most American brands of kegged beer, particularly those produced by craft breweries that focus on styles such as IPAs, pale ales, and other American beers. The D system allows for a secure and effective connection for serving beer from these kegs.

The D coupler is widely recognized because it has become the industry standard in the United States, offering compatibility with the majority of American beer brands. This has led to its use being almost exclusive for American ales, making it an essential aspect of beer service in bars and restaurants serving these styles.

In contrast, other types of kegs typically utilize different couplers; for instance, German lagers often use S or A couplers, Belgian beers frequently require a specific type of coupler, and craft beers can vary widely. The prevalence of the D coupler in American ales highlights its significant role in the craft beer movement and emphasizes the importance of understanding keg types and their associated couplers in the beverage industry.