P79 50/200kHz, 600W, Navico 9-Pin600 W Our P79 is a dual frequency, depth only, in hull transducer that easily adjusts to hull deadrise angles up to 22. The P79 includes a plastic mounting base which is aligned to the centerline and secured inside the hull. Then it is filled with non toxic antifreeze. The transducer is inserted into the base and adjusted for the proper deadrise offset, ensuring the beam is shooting straight down for maximum echo returns. The eco friendly coolant