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Garmin® 010-12357-00 - In-Hull Transducer Mounting Hardware for HD-ID, GT20- TM Transducers - BOATiD.com
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Sensor echo sounder Garmin gt20 tm 77 \ 200 + 455 \ 800 kHz (4 pin) 010 01960 00 with mounting on the Tran and Troller|Fish Finders| - AliExpress
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Garmin GT20-TM Transducer with Temp 4 Pin Transom Mount DownVu 500W 010-01960-00 753759152758 | eBay
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