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This flange connects the upper radiator hose to the cylinder head on N4x engined BMW's. Due to the cooling system on many BMWs being made mostly out of plastic, over time these coolant flanges can become brittle and be the source of leaks.
Make sure you have enough coolant on hand before starting the job.
Please note: Part numbers are provided for reference only. For correct compatibility to your vehicle, please follow our fitment advice