Coolant Reservoir Expansion Tank with Cap fits models including A3, Q3, TT, Beetle (Car), and CC.Compatible with various engine types and model years as specified.Constructed from plastic, designed to meet OEM specifications for performance.Direct replacement part.Includes one expansion tank and one cap.OEM numbers: 1K0121407A, 1K0121407F, 1J0121321B, 1J0121321A, 3B0121321.Designed for use in hatchbacks, coupes, convertibles, SUVs, station wagons, and saloons.Vehicle compatibility includes specific variants of A3 (8P1, 8P7, 8PA), Q3 (8UB, 8UG), TT (8J3, 8J9), Beetle (Car) (5C1, 5C2), CC (358), and with matching engine and production year ranges.For accurate fitment verification, vehicle identification number or detailed vehicle information is recommended.