It's water. The way it behaves when it hits the ground would indicate that. Gasoline "soaks" into the surface and spreads. You would also see indications of the fumes / evaporation disturbing the image just above the surface of the concrete. Just because the hose goes to a metal stand some call a "gas pump" doesn't mean it picks up fuel from the tanks below. Not being able to see the plumbing, there's no telling what feeds the nozzle. Many have stated it can't be unless cars run on water. What about radiators? Those need water on occasion don't they? Maybe he had it installed specifically to do what the video shows him doing with it!!! Hmmm... I use a screwdriver as a chisel or pry bar sometimes and cheap calipers to scribe lines but a screwdriver isn't a chisel or pry bar and calipers aren't a scribe. Is it a fuel nozzle or just a nozzle? The answer is: It depends on what you use it for! Let's light a match and find out!