Review on 🔌 TeamProfitcom PWM Fan Splitter Cable – High-quality 4 Pin Adapter for Desktop CPU Fan Extension – Convenient 1 to 4 Converter – Braided Y Splitter Design – 10 inches (2 Pack) by Adam Gambel

I have bought many of these and have been pushing lines through (with Noctua industrial fans) for over a year now. They are useful for connecting fan controllers to four (or more) high-performance fans for liquid heatsink or air-only cooling. The lines are also thick and not easy to accidentally cut. One note though, remember this is for x4 fans and you may not want to run it directly from your MB if you have a lot of them.