This 4-conductor cable is used on the Ping Echosounder. You can splice it to the cable on your Ping to increase the length or you can use it to power other devices underwater. The cable is made with a pressure-extruded polyurethane jacket and flexible 24 AWG conductors. It’s really tough and abrasion resistant.
Sold by the meter (cut to length when you order).
Ping Cable (4 conductors, 24 AWG) [Variable Length]