Raymarine Active Depth/Temperature Thru Hull Transducer [T914]Retractable Through Hull Active Depth Transducer. This Sensor allows simple connection to the T122 Wirless NMEA Interface for use in systems whre boat speed is available from a GPS. Operates at 235kHz. Features: 2" diameter (51mm) Max. Hull thickness 2. 125" (55mm) Removeable for cleaning Easy connection to T122 interface Right angle cable exit Specifications: Temperature: Yes Speed Included: No Mounting Style: Thru Hull Chirp: No Box Dimensions: 3"H