I'm looking into extending some Cat5 because, unfortunately, running new lines just isn't an option. Over the course of my career, I've had nothing but back luck with female-to-female RJ45 couplers. It's just a service call waiting to happen, as far as I'm concerned. But I saw these junction boxes and wondered if anyone has ever had any experience with these?
https://www.amazon.com/InstallerParts-Cat-5E-Junction-Box-Shielded/dp/B008NCCHC6/