Final answer:
The color code for approved refrigerant recovery cylinders is gray.
Step-by-step explanation:
The color code for approved refrigerant recovery cylinders is gray.
In the United States, the Environmental Protection Agency (EPA) mandates that refrigerant recovery cylinders be painted with a specific color to easily identify their contents. The color code for approved refrigerant recovery cylinders is gray.
Examples of approved refrigerants include carbon tetrachloride, methyl chloroform, hydrochlorofluorocarbon-22 (HCFC-22), hydrochlorofluorocarbon-123 (HCFC-123), and hydrochlorofluorocarbon-124 (HCFC-124). These substances are commonly used in cooling and air conditioning systems.