Answer :
Final answer:
The recovery cylinders used with R410 must have a DOT rating of 400 psi, as it denotes the pressure that the recovery cylinder can safely tolerate.
Explanation:
Recovery cylinders used with R410 (a commonly used refrigerant in heating, ventilation, and air conditioning) must have a DOT (Department of Transportation) rating of 400 psi. This specification is strictly implemented to ensure safety when handling these cylinders. The DOT rating of 400 psi indicates the pressure the recovery cylinder can safely withstand. If the pressure were to exceed 400 psi, it could pose safety risks such as rupturing of the cylinder. Thus, when dealing with R410, you must use a recovery cylinder with a DOT rating of 400 psi.
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