How can you tell when a filter drier is stopped up?

A) You will see the accumulated debris in the filter's sight glass.
B) It will have a pressure drop of more than 2 psi across the filter.
C) The "plugged filter" flag will pop out of the leaving flare port.
D) You will hear a whistling sound in the filter.


B

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Fill in the blank(s) with the appropriate word(s).

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