What water saving technology could I apply to this tap (pic below). I can't identify its gender
I can't identify its gender


That looks like a female (internal) threaded tap. It takes a male (external) threaded insert.


  I really couldn't figure out what water saving tech would be most helpful


If you unscrew the hex insert using an appropriate spanner/wrench you can check the thread size and order an appropriate insert.

Personally, I find not turning the tap fully on, and turning it off early are good water saving solutions. You could also fit a service valve under the basin or sink and turn that half off.