That is the manufacturer and what you see is what you get, no tube. It is sort of a DIY unit if you are good with HD 12v applications. The real selling feature the company stresses is that there is no hull penetration so no fiberglass work. There are a couple of powerboats at our club that have them installed. In theory, the only time the bow thruster is in the water is at low speeds. When on plane the thruster and bow are out of the water. I have never seen a Morgan OI go on plane, I doubt we ever will. In this case the owner probably did that compromise thing. I REALLY want a bow thruster, I really DON'T WANT to cut a big hole in the bow of my boat so I will make the compromise of drag versus having a bow thruster?