The link to Garmin B150M Bronze 20° Tilted-Element Thru-Hull Transducer has been copied
Garmin's B150M flush-mounted bronze transducer with tilted element inside the housing accommodates 16° - 24° hull deadrises and eliminates the need for a fairing block. This 300W broadband transducer is designed to allow both traditional and Spread Spectrum scanning when used with a compatible sonar like the GSD 26. It provides both depth and temperature data to your Garmin Marine Network. 95-155kHz operating frequency. Maximum depth of 1,500'.
Flush-mounted transducer requires no fairing block