Join Two Cat6 Patch Cables Together to Make a Longer Cable The C6KEYCOUPLER Cat6 RJ45 Keystone Jack Coupler offers a practical, cost-effective solution for joining two RJ45-terminated cables together, to form one long cable. The RJ45 Coupler offers both durability and dependability and is backed by Lifetime Warranty. The StarTech.com Advantage - Easy to use and install - Backed by StarTech.com lifetime warranty