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Tony,
Ours works very well with either water (using siphon action) or air from a
small air track blower. unfortunately, we made it here so you will not be
able to buy one. See:
http://www.physics.umd.edu/lecdem/services/demos/demosd3/d3-22.htm
It has very low friction, so it shows important details of both the
normal and the inverse sprinkler action.
Dick
Dr. Richard E. Berg, Professor of the Practice
University of Maryland