BMW Genuine Expanding Nut - Black It is used in Coolant hoses, charge air -- - Cooling water expansion tank -- - Cover -- - Engine acoustics -- - Expansion tank -- - Expansion tank, intercooler -- - Expansion tank/coolant hoses -- - EXPANSION TANK/TUBING -- - Oil reservoir/components/Dynamic Drive -- - Relay for electric fan 800/1000W K5 -- - Relay, electric fan motor 850W K5 -- - Single components f headlight Xenon/ALC -- - Single components for headlight -- - Single parts, xenon Manufacturer Warranty: 24000 miles or 2 years Please see Product Description below for vehicle compatibility