sorry it was so long, but I figured more detail was better as this is not something that most people would want to own. I like playing with gadgets and my company manufactures Nitrogen seperators to allow welding companies to reclaim nitrogen and oxygen from the air. Very expensive machines, but that leaves lots of older trade-ins that I get to scrap for projects such as that above.
A cheaper option is a soft airline that has some expansion to it, soft silicone maybe. A high end needle valve will also protect against many spikes as well, so long as they are not sustained for days at a time.
