"Raymarine P19 Low Profile Through Hull Transducer Brand New Includes Two Year Warranty, The Raymarine M78713-PZ is a plastic, low profile depth only transducer which is compatible with ST70, ST60, ST290 instruments
It is compatible with aluminium and fiberglass hull material. This requires a 2"" hole diameter for installation and operates on 200 kHz frequency with 11 deg cone. M78713-PZ Features: Through Hull Transducer, Part Number: M78713-PZ, Frequency 200 kHz, Suitable w/ Fiberglass & Aluminum, Max Power 350W RMS, Maximum Depth 700ft, 2"" Hole Diameter for Installation, Can Be Installed on Deadrise Up to 7 Degrees, Depth Transducer, Includes 45ft Cable, Compatible With: Raymarines s ST70, ST60 & ST290 Instruments, For Raymarine Models: ST70, ST60, ST290 Instruments"