USB receptacle blanking cap
thingiverse
Purpose: Prevent Dust and Moisture from Accumulating on Metal Parts Inside. You can easily remove the cap by pulling it away from the metal part inside the ring. Once removed, plug the USB body into its designated slot after use to maintain cleanliness and prevent damage. Demonstration: https://www.youtube.com/watch?v=gHF3RmH810U&feature=youtu.be
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