I didn't want to take the chance on having a air bubble in the glass and so I installed this thru-hull, this ducer is a 20degree offset. I have had it in there now going on 2 years and it hasn't failed to read yet.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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