I ordered two of these Molex adapter to a faulty fan controller in the PC to bypass housing (which had already been found for me as an unnecessary gimmick). The adapter both work wonderfully and the installation is really simple. As previous speakers have already noted, there are no volts information on the connectors. As the cabling is standardized, however, this is not a big problem:
Clutch with black / yellow wires: 12V Coupling with Black / Red cables: 5V
Conclusion: Top Price / performance, extremely fast delivery (ordered Mittowch morning, delivered Thursday!), Strong buy recommendation