Product review (5 stars): It's magic!
To my amazement these little magical device had the abillity to stop and start the flow of water. I do not what mystical powers control these device but when inserted in the proper manner you not only control water but it has the ability to ward off money sucking leaches. To ensure the device is powered by good magic and not black magic you should unplug the black cord from the wall before inserting these magic coils.