I had the same problem a few weeks ago. The afix the transducer to the hull in the bilge and the transducer itself actually twists and locks into a sort of cup that is filled with polyethylene glycol that acts as a sonic conductor by filling all the imperfections in the hull. Mine was low. You can use non toxic RV coolant (got it at walmart) which is polyethylene glycol and water to fill it up. Mine has worked fine since.
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