The only way the washer will draw soap into the line is with either the black tip installed or with no tip in wand at all.There is a ball and spring inside of the pipe that the siphon hose hooks to so when you use the washer with alot or even a little pressure the ball is forced up and blockes off the soap inlet port.So if you use it with no tip in the inlet port is open cause the ball isnt being forced up by back pressure.I hope this makes sense.
You must use the low volume tip to use the soap. Any of the high pressure tips will not work.with soap.
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