A half-barrel keg, also known as a full-size keg, is a common container used for storing and serving beer. It typically holds 15.5 gallons, which is equivalent to about 165 12-ounce servings. This size is popular among bars, restaurants, and for large gatherings, making it a staple in the beverage industry. The half-barrel keg is made of stainless steel, ensuring durability and resistance to corrosion. It features a standard D-system coupler for easy tapping and dispensing. This keg type is often used for a variety of beer styles, from lagers to ales, making it versatile for different occasions.