The difference between S-type and D-type couplers lies in their design and functionality. While both are used for tapping European kegs, they have distinct features that make them suitable for different types of kegs.
1. Design:
– S-type Coupler: The S-type coupler, also known as the European keg coupler, is designed specifically for kegs that use The System “S” valve. It has a longer probe compared to the D-type coupler, which allows it to reach deeper into the keg.
– D-type Coupler: The D-type coupler, also known as the American Sankey coupler, is widely used in the United States and Canada. It is designed for kegs that use The System “D” valve. The probe of the D-type coupler is shorter compared to the S-type coupler.
2. Compatibility:
– S-type Coupler: The S-type coupler is primarily used for European kegs, including popular brands like Heineken, Amstel, and Pilsner Urquell. These kegs typically have The System “S” valve, which requires an S-type coupler for tapping.
– D-type Coupler: The D-type coupler is commonly used for American and Canadian kegs, including popular brands like Budweiser, Coors, and Miller. These kegs feature The System “D” valve, which requires a D-type coupler for tapping.
3. Functionality:
– S-type Coupler: The longer probe of the S-type coupler allows it to penetrate deeper into the keg, reaching the bottom where the beer is drawn from. This design ensures efficient tapping and minimizes wastage.
– D-type Coupler: The shorter probe of the D-type coupler is sufficient for tapping American and Canadian kegs, which typically have a shallower level of beer. The D-type coupler also includes a built-in pressure relief valve to prevent over-pressurization during tapping.
4. Differences in Brands and Brews:
– The System “S” coupler is commonly used for European beers, such as lagers and pilsners. It is compatible with kegs from various European breweries, providing a standardized tapping solution for these kegs.
– On the other hand, The System “D” coupler is widely used for American and Canadian beers, including ales, lagers, and stouts. It is the standard coupler for most domestic breweries in these regions.
In my personal experience as a brewer and sommelier, I have encountered various keg couplers and had to adapt to different systems depending on the type of keg being tapped. The S-type coupler is often used in European-style bars and restaurants, where brands like Heineken and Amstel are popular. Conversely, the D-type coupler is more commonly found in American bars, where domestic beers like Budweiser and Coors are prevalent.
It is important to note that using the correct coupler is crucial for proper tapping and dispensing of beer. Mixing up the couplers can result in compatibility issues, leaking, or difficulty in tapping the keg. Therefore, it is essential to have a good understanding of the different couplers and their corresponding kegs to ensure a seamless beer dispensing experience.