Genuine Audi A/C Refrigerant Discharge Hose (A5 Quattro A5 A4 Quattro) - 8T0816721D - This genuine Audi A/C Refrigerant Discharge Hose is a direct replacement for the A5 Quattro, A5 and A4 Quattro models. This hose is designed to keep the refrigerant in your vehicle's air conditioning system flowing correctly. It is made from high quality materials to ensure a long life and reliable performance. Part number 8T0816721D.