Genuine OEM Audi Engine Coolant Hose, part number 1K0121051Q. This hose is designed to transport engine coolant, playing a critical role in regulating engine temperature and preventing overheating. Constructed from durable EPDM rubber, it offers excellent resistance to heat, pressure, and coolant chemicals. Choosing a genuine OEM hose ensures correct routing geometry, proper sealing, and long-term durability for reliable fluid transfer.