Garmin AIRMAR B164 20° TiltGarmin AIRMAR B164 20 Tilt This bronze thru hull mount transducer performs well at high speeds and is an excellent choice for fiberglass and wood hulls. This flush mounted housing protrudes less than a quarter of an inch outside the hull and can sit on trailer rollers bunks without damage. An 8 pin 1 kW transducer, it has a depth of 1,200 to 1,800 ft; an operating frequency of 50 to 200 kHz; a beamwidth of 22x20 or 6x6 degrees; and mounts on a 16 to