Keep your Draft dispensers clean and sanitary by preventing fruit flies and other fungus gathering at the spout. Traditionally a bartender would twist up a napkin and shove it into the draft spout, but now we have come up with a brilliant solution. the Cap a Tap is made from a quality rubber and fits perfectly snug over all standard beer taps. They are sold by the dozen only and measures in at 2 1/4" in height with a 1/2" diameter.