Fine tune the Danger Den - TDX to your water cooling setup. Includes Socket Wrench and Five Nozzles:#2: 10% Bigger#3: 20% Bigger#4: 10% Smaller#5: Multiple Smaller Nozzles#6: Blank - make your own.
Taken from the DD site.
From reading that I can guess that the nozzles go inside the barbs, and reduce or improve water flow?
Or are Nozzles the pattern on the copper (fins) that help absorb more heat into the water.
So what are Nozzles and What do they do?