I got a small liquid-tight clear plastic box that I cut the bottom out of, then contoured it to the bottom of my sit inside kayak. Glued the box to the bottom of the boat under the seat with marine goop, then routed the transducer wires under the seat to the transducer box and the removable battery box (behind the seat). I add water to the box as needed and the transducer and wires are protected. I can switch the transducer & depthfinder to another boat in a few minutes if necessary. I have my eye on a sit on top peddle power kayak that my be in my future.
Jim