A dribble port is just a small hole drilled near the top. If you need to add water while you are building lather you just tip the scuttle and some of the water dribbles in. It's not necessary but it was available so I figured I would give it a try. You have to email Julie to add it. She will also do different colors with in reason even though its not listed on her site. I wanted just a plain black one and she made it for me. Like I said she is great to work with.