This connector converter can convert a 7.4 x 5.08mm male connector with center pin to a 5.5 x 2.1mm male connector.
The back end of this converter is a 7.4 x 5.08mm female jack:
![](http://site.bixnet.com/images/products/CNT-YL61-MF.jpg)
It can plug to a 7.4 x 5.08mm male connector, convert it to a 5.5 x 2.1mm male connector like this:
![](http://site.bixnet.com/images/products/CNT-YL-PlugtoCable.jpg)
Note: 7.4 x 5.08mm connector is widely used on Compaq, Dell and HP laptop power adapters.