Garmin GST 43 Thru-Hull Speed/Temperature Transducer [010-04283-00]GST 43 Thru Hull Speed Temperature Transducer The GST 43 is a thru hull transducer that can read water speed and temperature. The transducer can retrofit an existing Nexus 43mm thru hull transducer (TH43). Bundled with the GST 10, the GST 43 can connect directly to the NMEA 2000 network, and the information can be displayed on a compatible Garmin chartplotter or instrument display. WARNING: This product can expose you to chemicals which are known to