Flexible Coolant Pipe - 1ft (1/2")Sparkfun
These plastic Flexible Coolant Pipes have been primarily used to spray refrigeration or washing fluid for machine tools but, thanks to their articulation, they can be used in a multitude of different ways as well. We use them as extra arms for our third hand.
The coolant pipes are 1ft long with a nozzle diameter of 3.5mm and 1/2"-20 pipe thread. Check the drawing below.