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If your chemical injector pressure washer attachment works fine without a nozzle, but stops working when the soap nozzle is attached, try checking the set screw that connects the nozzle to the injector. If you have made that adjustment to your pressure washer attachment and are still having difficulty, dismantle the soap nozzle, and check the spring and ball assembly inside. Sometimes left over soap or other build up can cause a blockage. You may also need a larger soap tip for your pressure washer attachment.