Review on Enhance Your Network Connection With Dingsun RJ45 Coupler - Compatible With Cat5, Cat5E, Cat6, And Cat7 Ethernet Cables (Black 10 Pcs) by Trey Samuels

This is exactly what I needed to simply patch together two cables I had to reach a device that was a great distance from my hard wired equipment. I had plenty of shorter cables (15 and 25 feet) and the computer I wanted to run a wired connection to rather than wifi was about 35 feet from my switch. Rather than spending much more money to get a 50 foot cable, I spent less money to get this coupler, and it works fine. I've got a 25 foot Cat6 paired to a 15 foot Cat6 with one of these adapters and the speed is fine - no additional lag by adding a second cable (I ran speed tests with just one cable when I moved the computer to the end of the 15 foot and then the two cables coupled with this adapter).The adapter includes 2 couplers as well as four RJ45 plugs. Frankly, I don't understand why these are necessary - if you are rolling your own cable you'd just make it the length you'd need and skip the coupler.In any event, the coupler performs well and does exactly what it is designed to do.