The foam lance is a pleasure to use. It effortlessly plugs into the quick connect coupler at the end of your spray wand. The soap flow rate is easily adjusted with a turn of knob putting you in control of how much soap is used. The most satisfying part is the instant and impressive results as it covers your vehicle with a layer of suds that will breakdown and loosen dirt and grime. After you give the soap a few minutes to do its work, you can use a regular high-pressure spray nozzle to clean it all off and make it sparkle.