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Old 03-12-2010
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Why not just replace the depthsounder. It would help if you said what kind of boat you had in your signature or include it in the post. If the boat has a solid glass hull, you can install a new depthsounder without installing a new through-hull, since most modern depth transducers can easily shoot through a solid glass hull.

One way to do this installation is to set the transducer on a ziploc bag full of water. Move it around until you find a spot where it gives a good reading.

Mark the spot on the hull and then fiberglass in a 4" PVC schedule 80 clean out fitting to the hull there.

Cut a hole in the clean out fitting cap and mount the transducer in the cap. Fill the cleanout with mineral oil or non-toxic antifreeze.

Screw the cap into place.
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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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