@Mitya just now getting back to this. Trying another way to describe the situation I had: the gasket wasn't cut on one side to allow it to be placed around a cable that already had a RJ45 on end of...

Yannie wrote Do you mean the Waterproof Rubber Insert? It would be more clear if you could upload some pictures. If you get a faulty part, I suggest you email TP-Link support for a part replacement....

First post here but have read numerous posts (which really helped) before purchasing this unit as potential solution. Minor issue but discovered that the insert/grommet designed to seal cable isn't...