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Hi Stan.
I don't know much about ceramic seals so I can't help you there, but
your ambient sub does not need anything more than the existing shaft seal on its
trolling motor as long as the motor housing is pressure equalized against the
outside water pressure.
Then it's just like you were running the motor at the surface
since there would be no pressure difference either way on the
seal. So you would not need anything other than the stock shaft seal it came
with.
Kindest Regards,
Bill Akins.
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