Vetus fiberglass tunnels are required to install bow thrusters on fiberglass or wooden boats. Select the appropriate tube diameter based on the particular bow thruster model specifications. It is most cost effective and efficient to err on the side of a longer tube if unsure of the particular length required for the vessel.
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The smaller the diameter of the thuster tunnel, the less resistance it will cause when under way. In addition, a smaller tunnel may be installed further forward which enhances the turning moment of the boat.
Diameter (inches) x Length (inches)