Genuine OEM Audi Engine Breather Hose, part number 07K103221H. This essential hose is a component of the engine's crankcase ventilation system, responsible for channeling gases from the cylinder head cover to other parts of the intake system. It helps manage internal engine pressure and prevents oil contamination. The hose is typically made from durable, oil-resistant rubber or reinforced plastic to withstand engine bay conditions. Weighing approximately 0.055 kg and measuring 0.192m in length, it ensures correct routing and a sealed connection. Using a genuine OEM breather hose guarantees precise fitment, resistance to oil and heat degradation, and proper function of the ventilation system, which is vital for engine longevity and emissions control.