Apparatus and method of installation of a lateral junction for a multilateral wellbore having a main bore and a lateral leg which extends away from the main bore. The lateral junction includes a seal bore diverter (28), having a window (36) and a hanger (44) that is insertable into the seal bore diverter to form the junction. An engagement mechanism comprising a hook (42) and a tab (62) interlocks the hanger and seal bore diverter together at the crux of their joining. The tab (62) in the hanger is defined by two lateral windows (60).
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