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Karcher 411A?

The tube syphoning the soap is not functioning.I am trying to get inside the m/c because it has been suggested that the ball valve inside has stuck. I was advised that I would need a screwdriver with a 'T15' head to loosen the casing holding screws but to no avail.Can anyone give me further advice?
John L, May 2011
Try using a T-10X100 driver, this will remove all of the screws except the one to the left of the on/off switch, still trying to find out which driver can remove this screw as the above driver will not work on this screw.

jimb49, July 2011
link Click here to see other fixes for Karcher.