This coolant radiator expansion tank is designed for A4 B9 (8W) 2015-2024 and A5 2020-2024 models with 2.0 TFSI engines.It replaces OEM part numbers 8W0121405G, 8W0121405A, 8W0121405E, 8W0121405F, and 8W0121405L.The tank is constructed from plastic resistant to heat and corrosion.It features a compact design with approximate dimensions of 25 cm (width) x 35 cm (length) x 25 cm (height).A coolant level indicator aids in monitoring fluid levels and detecting potential leaks.The capless design allows for straightforward maintenance.This part is engineered to match fitment and function, requiring no modifications for installation.Compatible with A4 B9 (8WH, 8WJ) 2.0 TFSI, A4 B9 Avant (8W5, 8WD) 2.0 TFSI, A5 (F53, F5P) 40 TFSI, A5 Convertible (F57, F5E) 40 TFSI, and A5 Sportback (F5A, F5F) 40 TFSI models.