Do we have any expert plumbers on here? 

I've got an inside plumbing connection which is designed to go either in the kitchen or laundry. It's NZ sized and goes into the water supply before it goes to the sink tap. I don't want to tap into this connection.

It's like the photo below, but with the branch off to a new line which is controlled by a ball valve but the main unit has a male and female end. I want to use this as the branch off is what I need.

So want I'm wanting to do is, on the end where water enters (i think that's the male end) connect this to a garden hose and on the female end put an end cap on there.

What size would all this be? from a ruler is seems about 21mm but should be a universal size I assume? where can I get parts to do something like this? 

It's very close to this