Material: Made of high-quality brass, with an adjustment function that allows you to dial in the sprayer for any situation. Fill the reservoir bottle with soap, click the gun or trigger of your existing pressure washer, adjust the knob for the desired suds level, and spray! EASY TO USE: Pour some soap into the bottle with warm water to get a thick lather, attach the 64mm quick connect plug to the pressure washer gun or wand, adjust the knob on the top to the desired lather level, and the foam jet will Disperses thick lather. Adjustable Nozzle: For precise mixing and foam generation. Turn the top knob (-) to the right for the thickest mixture, adjust the nozzle for the proper spray pattern, then let it loose. MULTI-PURPOSE: Great for car cleaning, window washing, driveway, roof, siding washing, best product for detailing your truck or SUV.