NG double head Outdoor RJ45 LAN Connector Ethernet Network Cable Extension coupler Adapter waterproof Female to Female Used to connect two RJ45 cables together, Make two RJ45 cables work as one cable. 8 Conductors w/ Gold-plated contacts Waterproof IP67 Its great for use in marine, warehouse, or any wet environment. It also has potting inside of it to prevent any water intrusion in case the cable breaks or someone forgets to put the seal-cap back on.