Review on 🔌 ThreeBulls 2 Pack PWM Fan Splitter Cable, Sleeved Braided Adapter for Computer PC Fan Power Extension, 1 to 3 Converter for ATX Case Cooling Fan Cable, 10.6" 4-Pin/3-Pin by Robert Elder

They worked great. I have confirmed that both splitters are working. The cables appear to be of decent quality with a nice jacket. As another handy reviewer before me said, only one of the 3 headers is 4-pin, but that's what you want to share 3 fans on the same motherboard with a 4-pin fan header. So only one fan interacts with the mainboard, the other two do the same. I tested this with the motherboard fan speed software; All three fans change speed at the same time. Works perfectly.