4H2 819 337 B · Coolant hose Audi genuine (OEM) part number 4H2 819 337 B, Coolant hose. Fitted on (3)HOSE — pos 16 (KAT696.BIN)HOSE — pos 15 (KAT771.BIN)HOSE — pos 15 (KAT771.BIN) Open the interactive exploded diagram →