According to the applicant this is a filter used in the pharmaceutical industry. The filter consists of a plastic housing which contains a stainless-steel mesh gasket in the centre, used for filtering media (liquids).

GIR 1 and 6 HSEN Note (II) (A) TO HEADING 8421 Text to codes 8421, 8421 29, 8421 29 80, 8421 29 80 90