The Soap nozzle works great and eliminates wasted time by applying cleaning solutions to your project instantly with ease. The soap nozzle has a larger orifice than spray nozzles which not only allows room for soap mixed with water; but also reduces the P.S.I. When your pressure washer is operating under low P.S.I it’s able to draw cleaning solutions from the chemical container. It’s is important to use the soap nozzle when you apply soap/cleaning solutions. You can NOT use a regular spray nozzle (red, yellow, green, white) when applying soap/cleaning solutions.