Tacktick T914 Active Depth Temperature Transducer. Retractable Through Hull Active Depth Transducer. This Sensor allows simple connection to the T122 Wireless NMEA Interface for use in systems where boat speed is available from a GPS. Operates at 235kHz. 51mm (2") diameter. Max. Hull thickness 55mm (2.125"). Removable for cleaning. Easy connection to T122 Interface. Right angle cable exit.