Some soap injectors have an adjustment that must be turned to allow or increase the amount of soap that enters the line. To make it work, install the blace tip on the wand (black tip has a very large hole/nozzle). With the black tip installed there will be very little pressure in the discharge hose and soap will enter. If your machine does not have an adjustable injector you dont need to do anything for it to work. If soap does not enter, stop enging and turn off water. Remove the injector fitting and check for debris. There is uaually a spring and checkball (very simple design).
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