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RV-220S RealVision 3D Thru-Hull CHIRP Bronze Transducer - 20° - 2M Cable Replacement, The RV-220 system features rugged cast-bronze thru-hull bodies suitable for fiberglass or wooden hulls. One transducer transmits and receives to port and downward, the other to starboard and downward, ensuring a full 180° of underwater coverage even on boats with deep keels or other underwater protrusions.