Coolant Vent Hose - E9x E82 with N51, N52 engines

This part is listed by BMW as BMW part number 17127618510 (17-12-7-618-510) and is described as Cooling Vent Hose for E9X 3-Series and E82/E88 1-Series with N51, N52 engines.

This small-diameter coolant lone attaches to the upper radiator hose and connects to the coolant reservoir.
 
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BMW Fitments:

1 Series
E82 / E88 (08-13) > 128i
3 Series
E90 / E91 / E92 / E93 (06-13) > 323i
E90 / E91 / E92 / E93 (06-13) > 325i
E90 / E91 / E92 / E93 (06-13) > 325xi
E90 / E91 / E92 / E93 (06-13) > 328i
E90 / E91 / E92 / E93 (06-13) > 328xi
E90 / E91 / E92 / E93 (06-13) > 330i
E90 / E91 / E92 / E93 (06-13) > 330xi