Genuine OEM Audi Coolant Hose with Regulator, part number 7P0122101E. This critical component is designed to both transport and regulate coolant flow within the engine cooling system, ensuring optimal operating temperatures and preventing engine damage from overheating or overcooling. It is integrated into the cooling system's fluid path. Constructed from durable, heat-resistant rubber and featuring an integrated regulator, this hose weighs approximately 0.24 kg. Choosing a genuine OEM coolant hose with regulator ensures precise temperature control, correct routing geometry, and resistance to high temperatures and pressures, which are vital for reliable engine performance.