Raymarine M78717 200Khz, Retractable Bronze Low Profile Transducer, St40/60/290,

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B17 bronze low-profile thru-hull depth transducer, Mfg# M78717, 200kHz, 250 Watt, 13 deg beam angle, 2 inch shaft, with retractable insert. Includes 45' cable for St40/60/290 instruments.