Humminbird (who also made Livorsi fish finders) changed the connectors at some point. My fish finder used a different connector than the upgraded transducer. However, the adapter is chargeable. In my case, buying a whole new sonar made more sense than buying an adapter. I sent this back (no problem via Revain!) and ordered a new fish finder. The fish finder is no longer available with a torso shot transducer, but Humminbird offers a free replacement transducer and I was able to get this transducer to replace the tail transducer that came with my new fish finder.
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