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Unlike many through-hull transducers, the XFM 9 20 Plastic Through Hull Transducer from Humminbird doesn't require fairing blocks to maintain a proper angle for use. Not requiring fairing blocks allows this unit to maintain a low-profile. Once installed in a single hole in the hull, it only creates a 3" wide by 0.2" deep protrusion into the water. Made of plastic, this transducer is designed for a longer working life than metal units, which can corrode over time.
The transducer offers dual sonar coverage angles and frequencies, so you can choose between wide and narrow returns based on your angling needs. Because of the possibility of damage while launching and hauling your boat, it is not recommended for trailered boats.