It’s not water cooled but v3 superchargers use a liquid cooled cable.I really don't believe it's water cooled
if the cable gets hot it's much cheaper, safer and way and more efficient to increase the conductor size (and keep it short) than it is to add water pipes and everything required to make that work.
However it is a bloody heavy cable with serious safety requirements - don't think anyone should bring your own.
Tesla patents new liquid-cooled charging connector
Tesla has filed for a new patent on a design for a liquid-cooled charging connector, like the one used at...
electrek.co