When you have a clog in your water/air line, install one of our blank burs, run your handpiece with the water/air on, and "poke" the water and air ports with the clean-out wire. Most of your clogs occur right at the exterior port at the head of the handpiece.
Time will tell but so far everything from delivery speed to the kit and instructions it came with as well as installation and function so far has been excellent.