Garmin GDT 43 Depth and Temperature Transducer 43mm Black. It can retrofit an existing Nexus and Silva 43 mm thru-hull transducer (TH43). When bundled with the NMEA 2000 adapter the GDT 43 can connect directly to the NMEA 2000 network and the information can be displayed on a compatible Garmin chartplotter or instrument display. Specifications for Garmin GDT 43 Depth and Temperature Transducer 43mm: Manufacturer: Garmin Size: 43 mm Color: Black Package Contents: Garmin GDT 43 Depth and Temperature Transducer 43mm GDT 43 GDT43 depth transducer GDT 43 NMEA 2000 GDT 43 depth transducer NMEA 2000 adapter Garmin 010-01749-00: GDT 43 Depth and Temperature Transducer 43mm Black