1K0 819 374 B · Coolant hose Audi genuine (OEM) part number 1K0 819 374 B, Coolant hose. Fitted on (2)HOSE — pos (8) · BAG,BLP,BLF (KAT412.BIN)HOSE — pos 8 · BU (KAT638.BIN) Open the interactive exploded diagram →