Use these 3 pin fan cables to organize your custom PC system. They're great when using several 3 pin cooling fans in your rig. The dual fan 3 pin splitter connects 2 fans with a single motherboard 3 pin hub header. Darkside cables are custom sleeved in black for 3 pin computer cooling fans. They can also help when you need to extend PC cooling fan headers, fan controller or the fan hub in cases that include Antec, Case Labs, Corsair, Fractal Design, Inwin, NZXT, Phanteks, and Thermaltake.