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Thanks for the input. I'll keep that in mind. Like others have suggested, I think I'll just drive around to the ones in my area until I get someone that will trade it. Starting with those smaller ones sounds more appealing at this point

At this point, I feel pretty confident that it's CO2. After researching the types of gases and which ones liquefy, I feel good about trying it out. I'll report back when I get my applewine carbed up

I just tried to fit the regulator on the tank and it fit. I'm confident that I have CO2 so I'm going to carb up a small batch of applewine and see what happens. Thanks for all of the helpful input. Here are a few resources for future reference. https://www.concoa.com/cgachart.html...

That makes more sense. Thanks

I'm likely going to give this a whirl, regardless of what's in my tank Speaking of the tank, I lined up some tests/checks to do and I'm through some of them. As of now, I am almost positive there's liquid inside. I can feel some shifting when I tilt it so I think I'm good there. Also, the gas...

That chart is amazingly helpful. Thank you. I'll check for the fitting too shortly. A couple other things I found interesting and helpful: If I remember correctly, the tank is filled with liquefied gas which means it's limited to a small number of possibilities including anhydrous ammonia...

So you're saying that nitrogen, helium, and argon typically have higher working pressures? I couldn't find much info on that. I'll try to see if it's flammable later on today. It seems that helium, argon, and nitrogen are all tasteless, odorless, and clear. They're also non-flammable and...

I would love to be able to trade in this tank without paying for it to be retested but I haven't heard that this is possible all that often. I'll call around to see. That would make it much more reasonable to keep and use this thing.

Hmm good point. The guy I spoke with said trying to use it as a CO2 tank wouldn't work since CO2 tanks need to be able to hold pressures higher than mine will hold. Does that sound right? edit: Also, paying $25 to hydro test, $20-25 to fill, and $15-20 to re-valve, may not be worth it

I'm leaning that way. I think that I'll do what I can to verify it within reason and then take it from there.

I'll check when I get home. I don't think there are any other markings but I haven't checked the threads.

That was my plan to find out whether or not it's helium. I didn't know I could use argon for that role. I think my worry is, at this point, assuming it's a safe gas and poisoning myself if it's not.

I'm going to keep going with my updates for anyone that runs into a similar problem in the future. I called a welding shop and the guy told me there's really no way to finds out what's inside except to get the gas analyzed. I'm not sure I fully believe that since I imagine there are qualities...

I'll see what I come up with. Thanks!

Think it's worth anything with a hydro date of 1994?

I'm thinking I might just sell the regulator and then the tank on craigslist. Getting it hydrotested, then getting the valve replaced, and then getting the tank filled sounds expensive. I think I could get a few bucks from selling it all to make buying a used tank substantially cheaper. Also, I...

Thanks for all the feedback everyone. I suspected this so I did a little more digging after your comment. I realized that the model number of the regulator is on the bottom of the face of the dial (8410102) and found my answer from that. Apparently, this regulator is for helium, argon, and...

I did a little research on that and it looks like it's something I've got to pick up from a chemical supply company. Seems simple enough of a test if I could find the stuff. Thanks!

I didn't know that. I've been doing a little reading and I'm seeing that color of the tank isn't necessarily reliable. My only other tank was actually a red one too but I'm thinking that was a coincidence. I will likely just run it by a Praxair for testing. Thanks

I bought this old tank and regulator at an estate sale and while I think it's a CO2 tank, I want to verify. Is there anyway to know from the pictures? The basement of this place had some other brewing stuff so I'm not too worried but I don't want to pumped my beer full of some other gas...