It is not recommended for trailered boats and is necessary to have it professionally installed due to the fact that it requires a hole be drilled in the hull and the shaping of a fairing block. The transducer is for single or dual-beam use with 20/60 degree beam angles and operating frequencies of 200/83 kHz. It comes with a 30-foot connecting cable and all the necessary mounting hardware, but does not include a fairing block. XTH-9-20 Features: Bronze Thru Hull Transducer, Single/Dual Beam Use, 20/60 degree, 200/83kHz, Transducer Dimensions: 5.25L X 2.75" W X 1.2" D (below hull), Shaft Diameter: .86", Fairing Block not Included, For Humminbird Models: PiranhaMAX Series: All except 240, 180, 165, 175, 176i, 195c, 196ci, 197c, 100 & 300 Series: All except DI models, 500 Series: All except DI models, 600 Series: All except DI models, 700 Series: All except DI models, 800 Series: All except DI models, 900 Series: All except DI & 3D models, 1100 Series: All except DI models, HELIX Series: All except DI models, HDR Series: HDR650"
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