Standard Airline Tubing Hose Barb - External Threads

Working on a project based off of Grant Thompson's HHO generator. I needed some hose barbs to funnel gas to a bubbler. Couldn't find any that fit for my purposes at the hardware store so I made my own.

Got inspiration from this:
[M8x1.25 Thread to 3/16 Hose Barb Fitting](https://www.thingiverse.com/thing:2540860)

It's a standard hose barb design, but I needed one with different specifications.

* External threads to make installation and future tightening easier.
* Longer threads to us