If you want to use wired Ethernet with a Raspberry Pi mounted in a waterproof enclosure, this little connector is for you! It features two back-to-back RJ45-connectors. Connect the Raspberry Pi Ethernet port to the inside connector and an external Ethernet cable to the world-facing connector. No need to compromise the waterproofness of the enclosure!
Hole size 21-22 mm (thread outer diameter 20.7 mm). Maximum diameter 30 mm.