Connect 1/4" quick connection plug to Pressure Washer Gun or Wand. Finally, adjust the knob on the top to desired foam level and then Foam Blaster will disperse thick foam. The knob adjusts the foam dispensing amount and the nozzle adjusts the sprinkle pattern. ★Adjustable nozzle for accurate mixing and foam generation. Turn the top knob right (-) to get the thickest mixture, adjust the nozzle to get a proper sprinkle pattern, and let it loose. ★5 Nozzle Tips have different angle (0,,,, degree). Choose different nozzle according to the actual need. Such as watering flowers and plants, washing car. They also can be attached to a Quick-Connect Wand for swifter application and more. Max pressure is up to PSI. ★Application: ideal for Motorcycle, Car Washing; Roofs, Driveways, Siding washing; floors, Windows washing, it is best product for Detailing Trucks or SUVs.