Why must cylinders designated refillable by the Department of Transportation be used for transporting recovered refrigerant?

Cylinders designated as refillable by the Department of Transportation (DOT) must be used for transporting recovered refrigerant to ensure safety and compliance with regulations. These cylinders are specifically designed to withstand the pressures and chemical properties of refrigerants, minimizing the risk of leaks or failures during transport. Using non-refillable or improperly rated cylinders could lead to hazardous situations, including potential environmental harm and violations of federal regulations. Thus, adherence to DOT guidelines is crucial for safe and responsible refrigerant handling.