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. The internal agitator then creates the dense foam which maximizes dwell time on the surface that needs to be cleaned.

To install on certain models of pressure washer such as Greenworks, AR, Ryobi, or Sunjoe, two other fittings are required. See 24.0481 and 24.0448 to adapt to these machines.

**NOTE** Foam Cannons do not operate on Pressure Washers that have Flow-Sensing unloaders. Typically, you will have pulsing foam indicating pressure spikes and drops which the flow-sensing unloaders cannot accommodate.