Inside Hull Transducers mount to the inside of most fiberglass boat hulls and transmit the sonar signal through the hull. For angles greater than 15 degrees, an angled transducer is recommended to assure the sonar signal travels downward.

Humminbird XAP-9-20 Angled Puck Transducer is compatible with: Piranha 1, Piranha 2, Piranha 3, Piranha 4, Piranha 5, Matrix 15, Matrix 17, Matrix 25, Matrix 27, Matrix 55, Matrix 65, Matrix 67, Matrix 97, FF515, FF535, FF565.