[bharada]

The needle valve should be threaded to accept a standard sized brass fitting. All you need to do is get a mating part that has an appropriately sized compresion fitting on the other end that will accept the 1/8" copper tubing.

 

[bharada]

Niko, can you suggest any sources for purchasing a large quantity of the CO2-resistant tubing?

Thank you all for your replies.

Here's one place. $79 for 100'.