4N0 121 081 BK · Coolant hose Audi genuine (OEM) part number 4N0 121 081 BK, Coolant hose. Fitted on (3)HOSE — pos (4) (KAT838.BIN)HOSE — pos (4) (KAT838.BIN)HOSE — pos 4 (KAT838.BIN) Open the interactive exploded diagram →