A Pressure Vacuum Breaker (PVB) is being tested and the air inlet valve fails to open when the supply pressure is reduced to zero. What should the tester do?
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A
Record as a pass because the check held
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B
Record the PVB as failed due to a malfunctioning air inlet
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C
Add lubricant to the air inlet and re-test on site
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D
Test again with higher inlet pressure