This unit is the highest production HHO generator I have ever seen. Its crazy.
It appears to be some kind of stainless steel tube within another tube with zip ties to separate and insulate the anode from the cathode.
I am not sure of the physics here but it sure makes some serious HHO gas bubbles.
A PWM pulse width modulate is also used to control the amount of HHO produced and the amperage that it takes to make the HHO.
He is using a water filter canister for the container and has heated the water to simulate he production going down the road after the electrolyte solution has heated up.