According to the information provided by the applicant and the illustration at hand, it is a so-called "sealing cap with rubber fastening IP67" made of plastics in the sense of Note 1 to Chapter 39 (giving character) with a sealing washer made of plastic or rubber on the inside. The waterproof cap (Ø 29 mm, H: 25 mm) is also placed on the USB connector to protect the contacts from damage, dirt or moisture. A securing band in the form of a plastic strip with an eyelet is attached to the top of the cap by means of a metal screw. Classification under heading 8538 is ruled out as it is merely an accessory for connectors. Such products are classified under customs tariff law as "other goods made of plastics, other than those covered by code numbers 3926 1000 00 0 to 3926 9097 77 0".
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[1][1]. DEBTI47601/21-1#755050