This simple black rubber plug is the perfect solution to the never-ending battle of overnight visitors (fruit flies) in your draft beer spouts. Easily keep it sanitary, and don't worry about that first poured draft of the day being filled with unwelcome guests! These plugs fit snugly in your draft spouts. They are designed with a slight slope, therefore accommodating any spout. The smaller spout stop is a fit perfect for Guinness and stout faucets.