ITEM NAME:Automotive Water Hose Fitting Replacement for BMW 335I, 335Xi, 135I , 2006- D9E6 Automotive Water Hose Fitting Replacement for BMW 335I, 335Xi, 135I , 2006- D9E6 FUNCTION: Designed to maximize the resistance to breakage, coolant flow path through the center of the fitting is optimized to maximize coolant flow LONG LASTING: Made from high strength aerospace aluminum, Grade 6061 T6511 EASY INSTALLATION: Simply remove the end of the hose from the plastic fitting and then the fitting from the head (hose does not need to be removed from the thermostat housing to do this);Then install the replacement aluminum fitting to the head and slide the hose and hose clamp over the fitting FITMENT: The water hose fitting fits 3.0L twin-turbo N54 (3.0-litre twin turbo) motors 335i, 335xi, 135i and the N53 (3.0-litre non-turbo) 2006 - 2010 325i, 330i, 525i, 525xi, 528i, 528xi, 530i, 530xi and the N20 (2.0-litre turbo) Z4 2013-, and the N52 X3;also fits the next generation N55 motors in all chassis This product is a direct replacement for the plastic fitting on BMW PN 11537541992 and 11537544638. This aluminum coolant fitting is designed and manufactured to precise tolerances to fit the original application but with notable improvements in function. There are no sharp corners on this fitting so that the coolant will not be disrupted as it passes through. This hose runs from the coolant thermostat housing to the front of the head