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.
Note: These hoses are a bit over-sized. They should have a 1/2-20 thread, but they are a bit too big to fit into a 1/2" hole by hand. You can use a wrench to get them in, it will just be a tight fit. Keep this in mind if using these with the third hand base. Check the drawing below.
Product pictures and description are of Sparkfun.com