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The Watts No. TK-9 Model "A" Backflow Preventer Test Kit is a
compact portable testing device made for testing all Reduced
Pressure Zone Backflow Prevention Assemblies and Double
Check Valve Assemblies. The TK-9A is easily connected to any
RPZ device enabling accurate testing of zone differential
pressure, relief valve opening differential, fouled check valves
or similar problems that visual inspections cannot locate. The
unit is supplied with a rugged carrying case for easy handling