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D2-12 Prestolite dual-ring conductive slip ring, universal compatible with Prestolite 110A, 120A, 150A series bus alternator rotors. Made of high-purity copper outer ring and high-temperature resistant insulated inner hub. It transmits stable excitation current from stationary carbon brushes to the rotating rotor winding, essential wearable component to maintain continuous magnetic field generation for Prestolite bus air conditioning generators.
