What power supply cable is this?

[LudazTV]

I just installed two front fans into my PC, and I'm only just realising that there's nowhere to plug them into power? I found this little converter/extension thing that there's a picture of so I can have one running fan but I don't have any more of these converters. Does anyone know where I can find them? I use the 4-pin part on it to plug into one of the 4-pin receivers on one of my PSU cables that I don't need for anything else. Pictures are included to show issue in more detail.
https://gyazo.com/dde7b6e345274dfb6d5ea2c233830bfe
https://gyazo.com/fbea56afeb6894b9de59cc7116cf908a
https://gyazo.com/d40a1bbd6a10bf8caa5c76c87658d4ab

 

[misteriosly]

Usually that's a 3pin to 4pin adapter, search it in stores that you buy from.
https://www.google.bg/search?q=fan+3pin+to+4pin+psu&source=lnms&tbm=isch&sa=X&ved=0ahUKEwik77D44qnVAhUKBBoKHYADCPIQ_AUICigB&biw=1920&bih=1036#imgrc=_

 

[JackNaylorPE]

The first is a 2-pin power connector ... possible for powering LEds or other devices that don't utilize speed control.

The second is a standard molex cable with an adapter to provide the 2-pin power described above.

The third shows what appears to be a 3-pin fan cable. However with the white side having only 2 pins, it is incapable of providing speed control.

If that is a fan cable (black), you'd want to plug it into the motherboard's fan header instead of the PSU.

 

[x34c]

When I bought my PC it came with these converter things that you put into the 4 pin PSU molex and you can plug 2 fans into 1 molex.

 

[JackNaylorPE]

Yes you can do that .... not recommended as you have no speed control and those fans will be running full tilt whenever the PC is on which is both unnecessary and noisy. The "recommended" method is to plug them into the MoBos fan headers.