Product review (5 stars): If your washer overflows, this is likely the valve that needs replacing.
Kitchen-aid Dishwasher started overflowing with every cycle.  After looking for leaks I learned that water level is not supposed to come above the door so don't spend too much time thinking its simply a seal issue.  After searching for the solution, realized that this valve is a common culprit when your dishwasher overflows.  Installation was easy but cramped (all the parts are under the door near the floor). but accessible.  Hardest part was unscrewing the OLD 90 degree elbow off the old valve.  If I had to do it again I would just get a new 90 degree elbow as it took 20 minutes and there are no good leverage points.  Once I had everything teflon taped up again, installation is easy: screw in the supply line, replace the discharge hose and crimp, connect the plug to the solenoid, then single screw to hold it all in place.  Has worked perfectly since, no leaks.