661. The device shown in the illustration which is used for removing moisture from the liquid refrigerant in the system is labeled with what letter

The liquid-line filter-drier, labeled E, removes moisture and contaminants from liquid refrigerant. This component is essential for preventing ice formation at the expansion valve and corrosion within the system. Options B, C, and D represent the condenser, receiver, and a line valve, respectively, and do not perform this function.