BE Power Equipment pressure washer under car water broom is used to clean debris from under your vehicle. This attaches to the end of the common 1/4-inch quick connect fitting at the end of the spray wand. Once it is attached, its four nozzles spray over the surface riding on the swivel casters as it rapidly cleans your underneath any surface. This attachment should only be used on more powerful machines rated at 4,000 PSI and 4.0 GPM or more.