Amazon Humminbird  
10-05-2017 07:31 am
Humminbird 710214-1 Transom Transducer - XNT 9 20
Single/Dual Beam
20/60 Degree
200/83 kHz; 20' cable
More secure, especially at high force of waves
Improved running angle and an optional lockdown screw to override the kick up
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