O ring set for engine cooling system quick connect hoses For BMW E70 X5 3.0 Si N52 N52N 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: 2010 BMW X5 xDrive30i Sport Utility 4-Door 3.0L 2009 BMW X5 3.0si Sport Utility 4-Door 3.0L 2009 BMW X5 xDrive30i Sport Utility 4-Door 3.0L 2008 BMW X5 3.0si Sport Utility 4-Door 3.0L 2007 BMW X5 3.0si Sport Utility 4-Door 3.0L