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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...

I have a DB 1.5 and it is great. I went with the normal ridges and had Julie put in a dribble port Julie is awesome to work with and I would highly recommend doing business with her.