It's a soft rubber gasket - what else is there to say?
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27-5867 - DC Panel Mount Jack 2.1x5.5 Metal
DC Panel Mount Jack (Metal Housing)
Center Pin (I.D. Mating Plug) 2.1mm
Mounting Hole: 0.437"
MCM Cat 57, Page 348
MCM Cat 56, Page 324
MCM Electronics has always provided me with quality parts and service for many years. Never a bad experience.