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Air tank drains:
A.  Allow rain water to enter the tank.
B.  Are used to drain water and compressor oil from the air tank.
C.  Should never be opened.
D.  Must remain open during transit.
In an air brake system, the air storage tanks must be drained to remove accumulated water and compressor oil. Failing to do so can cause damage. Manually operated drains should be used at the end of each day of driving.
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