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Old 08-14-2011, 05:32 AM   #2
buttchaser
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Join Date: Mar 2005
Posts: 243
If you have a Humminbird FF you need a plastic thru hull Transducer. It could be one of the two depending on which FF you have.
XTH 9 20 P
XPTH 9 QB 90 T

http://store.humminbird.com/category...stic_Thru_Hull
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