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[–] auto_turret 0 points 1 point (+1|-0) ago 

Warning: I have no idea what the hell is in that end that goes in the water.

Transducer? Probably a microphone. Experiment with some microphone transducers. I'd bet you'd have to try many to replicate the original device's output. Might have to create your own gain circuit, if you can't find a transducer that makes the same output as the original.