Transducers, Extension Cables, NMEA 2000 network components are all available from Steveston Marine & Hardware. We have all the components and accessories available from Raymarine, Garmin, Lowrance, and Humminbird. Looking for a transducer? We have the best transducers available from AIRMAR. Almost every model of Fishfinder or Depthsounder has 3 transducer options: through-hull (cut a hole through the hull and mount the transducer), transom mount (off the back of the boat), or In-Hull (mounted on the inside of a solid fiberglass hull).