The Innovation of the PF-22 Foam Cannon lies in the nozzle. The MTM Hydro Foam Cannon offers not only adjustable fan blades but now offers an adjustable spray pattern (vertically or horizontally) as it throws thick foam onto your vehicle, house, fence, sidewalk, roof or other washable items. The chemical injection knob on top allows for more or less chemical to be drawn through the internal chamber, increasing or decreasing the foam output. This allows the internal agitator to create a dense foam.