This part is listed by BMW as BMW part number 11727540472 (11-72-7-540-472) and is described as Control Valve for Secondary Air Injection on Z3 2.5i, 2.8i, 3.0i (1999, 2000, 2001, 2002).
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BMW Fitments:
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 2.5
E36/7 / E36/8 Z3 (96-02) > Z3 2.8 99-00
E36/7 / E36/8 Z3 (96-02) > Z3 3.0