Humminbird XFM 9 20 Plastic Flush-Mount Thru-Hull Transducer
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
Compatible with many of Humminbird's Piranha, Matrix and numbered series sonar systems
Doesn't require a fairing block, and is backed by manufacturer's one-year limited warranty