The inside-the-hull transducer is the same as the transom transducer. It just comes with a package of epoxy instead of the transom mount hardware. If you want this just contact the Humminbird Customer Resource folks at 1-800-633-1468 about a transducer exchange. If a good job is done when mounting the DI transducer inside-the-hull, most would not be able to notice a difference in the sonar readings. You will not get water temperature readings though because the temperature sensor is on the bottom of this transducer.