O ring set for engine cooling system quick connect hoses For BMW 328i, 330i, e90, e91, e92, e93 N51, N52 engine AUTOMATIC Or MANUAL 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 affordable set This set is made of NBR material (same material as the original ones) Fits BMW Below: e90, e91, e92, e93 N51 N52 Engines 2006 BMW 330i 330Xi Base Sedan 4 Door 2007 – 2013 BMW 328i 328Xi Base Convertible Coupe Sedan Wagon 3.0L 2996CC l6 GAS DOHC Naturally Aspirated Auto or Manual 2 Door 4 Door