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9-Pin 9.8' Transducer Extension Cable by Raymarine®. The Raymarine E66074 Transducer Extension Cable is designed for DS400x, DS500x, DS600x and DSM25 (A65) fish finders. The Raymarine E66074 3 meter extension cable extends the length of your stock transducer cable. for extra-long runs on larger vessels. Plug-together connections for fast and easy installation.