O ring set for engine cooling system quick connect hoses for BMW F15 X5 xDrive 35i N55 engine Turbocharged straight 6 cylinders The O rings for the quick connect hoses are not carried by dealers. In most leaking situations the hoses are perfectly fine, and the leak is caused by dry O rings, which can be replaced with this low-cost set This set is made of NBR material (same material as the original ones) Fits BMW Below: 2014–2018 F15 X5 xDrive 35i (N55 Engine Turbo)