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In the color coding system, what color is designated for the top of recovery cylinders, with the bottom being gray?

A Yellow.

Recovery cylinders are color coded with grey bottom and yellow top. The gray color at the bottom serves as a visual indicator that the cylinder is specifically designated for storing recovered refrigerants, distinguishing it from other cylinders used for different purposes. The yellow color at the top acts as a visual reminder to ensure that necessary precautions are taken to prevent accidents or mishandling.

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