Built in Bow thrusters
		HydraNautics tunnel thrusters (as shown on left) are designed to use a flat sided tunnel built into the boat that allows the thruster to be removed and reinstalled with the boat in the water. 12 inch and 15 inch prop sizes are available in this style. This style allows for the use of large diameter props in shallow draft hulls.

HydraNautics tube thruster was specifically designed for the aluminum houseboat industry. The castings are aluminum, shafts and hardware are stainless steel. Standard US size aluminum tube and SAE stainless bolts and threads. Props are aluminum not the usual plastic like the other brands.