Humminbird XFM 9 20 Plastic Flush-Mount Thru-Hull Transducer

Amazon.com Price: $92.32 (as of 02/06/2019 12:26 PST- Details)

Thru-hull, flush-mount transducer, works with thinner hulls, while internal, steel sleeve provides extra reinforcement
Dual-beam, with 20-, and 60-degree beam angles and operating frequencies of 200 kHz and 83 kHz
Not recommended for trailered boats, and professional installation recommended

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