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The Humminbird XFM 9 20 Plastic Flush-Mount Thru-Hull Transducer is an economical alternative to bronze transducers, and works with thinner hulls such as aluminum. Constructed with an internal, steel sleeve that provides extra reinforcement, this thru-hull transducer is not recommended for trailered boats, and Humminbird recommends you have it professionally installed due to the fact that it requires a hole be drilled in the hull. The XFM 9 20 is a dual-beam, flush-mount transducer with 20-, and 60-degree beam angles and operating frequencies of 200 kHz and 83 kHz. This unit has a diameter of three inches, with a 0.2-inch below-hull depth and a shaft diameter of two inches. The Humminbird XFM 9 20 comes with a 30-foot connecting cable and all the necessary mounting hardware, and doesn't require a fairing block. The XFM 9 20 is compatible with Humminbird's; Matrix 12, Matrix 15, Matrix 17, Matrix 27, Matrix 67, Matrix 77, Matrix 87, Matrix 97, 727, 737, 767, 777C2, 787C2, 323, 343, 363,