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I used a piece of PVC pipe with a screw on cap with the transducer screwed into it. I glued the pipe to the inner hull and then filled the pipe with peanut oil. Or some oil which doesn't generate bubbles.
I did much the same as swampdoggy on a previous vessel although parafin was the supposed to be the good oil then but I found that parafin didn't like most silicone sealers and eventually leaked and I thought that gliserene has similar properties, a mate of mine had all sorts of similar problems. These days I thought that non toxic coolant fluid was the go, the green one from memory. At the moment noth my transducers our mounted outside on the hull but I am looking to building a wet box, it would be glassed into the hull.