Need help on fittings

[5ketch]

Hi all,

I'm new to the forum but not PC building. Quick question I'm bulding this rig featured on jayz yt channel:

https://youtu.be/5ZnDESqJdyU

Was wondering what fittings he has used in the picture below:

https://pasteboard.co/K257pve.jpg

I thought they were extenders but corsair don't make extenders well not in the hydro series anyway.

Your help is greatly appreciated

 

[5ketch]

Also If someone can list what fittings I will need numbers wise I can start ordering

Thanks