So the 4 compression fittings aren't npt, but I never took the other end out. I know it has a good seal with the Teflon tape so I don't want to mess with that. Especially since no matter what, the SS ends are welded on so I would need to find a mate for those anyways.
I found a plumbing supply store that might be able to help, going to see them tomorrow morning. The problem with the compression connector is that you still need a special fitting on your hose to mate with it... Almost like a ferrule or nipple. You can't just slide tubing into the compression end, it won't hold.
I do not know exactly what went through this coil in the past. At the time of its use, I was only involved in software for the project, so there were some processes and instruments that I was not privy too. I know there were some chemicals involved in the process I certainly wouldn't want inside my beer (helium, argon, etc). Luckily, when I thought this was a simple SS coil and not a CFC, I was only planning on running the return water from my IC through this. I know it's not as great as running wort through the CFC, but it's safer and it will do the job. Maybe I will eventually find a way to clean it out entirely, but for now it won't touch beer