Angled Puck TransducerInside Hull Transducers mount to the inside of most fiberglass boat hulls and transmit the sonar signal through the hull. On hulls with a deadrise less than 15 degrees, a flat bottom transducer should be used. For angles greater than 15 degrees, an angled transducer is recommended to assure the sonar signal travels downward. Description: Single/Dual Puck Angled Transducer.For Use 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.WARNING: This product can expose you to chemicals including LEAD which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.