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How is water and compressor oil removed from the bottom of an air storage tank?

A A drain valve is opened to remove the water and oil from the tank
Water and compressor oil are removed from air storage tanks through a drain valve. The water and oil can damage the brakes if left to accumulate in the system. Manually operated tanks must be drained every day to remove this build-up.
B The water and oil are siphoned out of the tank
C The water and oil are removed automatically as the brakes are used
D A sponge is used to soak up the water and oil