The separate transducer then attaches to the base with a twist lock.
Unlike traditional "puck" type transducers, our P79 consists of a base that is bonded to the hull and filled with liquid. P79 Plastic In-Hull 50/200 Khz Depth Only Depth , 50/200 kHz , 600 W RMS , Mid-performance , Plastic , 7 Pin Blue Connector. This ensures that the beam is vertically oriented to receive echos resulting in accurate depth readings.