A backflow tester uses a 2-valve (high/low) test kit versus a 5-valve test kit. The primary advantage of the 5-valve kit is:
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A
It allows isolation of each hose independently for more complex testing procedures
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B
It measures higher differential pressures than a 2-valve kit
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C
It automatically vents the relief valve during RPZ tests
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D
It eliminates the need to calibrate the gauge annually