https://ph.garmin.com/products/onthewater/bronze-thru-hull-mount-transducer-with-depth-temperature-8-pin-airmar-3/
Bronze Thru-hull Mount Transducer with Depth & Temperature (8-pin) - Airmar B258 | Marine | Garmin...
Garmin marine products include chartplotters, fishfinders, transducers, sonars, autopilots, boat radios and much more.
https://store.astm.org/b0258-02r08.html
B258 Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes...