This product is either discontinued or we cannot get that from suppliers.
Brand: Garmin, Model: 010-11613-00, Type: Adapter, Colour: Black, Compatible: echoMAP 70dv / GPSMAP 1020xs / GPSMAP 1022xsv / GPSMAP 557xs / GPSMAP 7407xsv / GPSMAP 751xs / GSD 24 Advanced Sonar Module / GSD 25 Premium Sonar Module / Plastic Transom Mount Transducer with Depth & Temperature (Dual Frequency, 6-pin).
This adapter allows you to connect the wires on legacy 6-pin transducers with newer sonar that require a 8-pin connection.