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Medical grade, or welding grade?
Makes a difference...
But I don't know what kind of money you'd be talking in either case.
If it's current on it's certifications/inspections, a few hundred at least to a welder, I'd imagine...
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That might belong to the company that filled it, there might be a deposit on it. When I was in the biz the supplier would pick up empties and leave full cylinders. When we changed suppliers they picked up all their tanks. It was a tankless job...
That's a weird regulator, or actually set up weird, with a special orifice for very low flow. That humidifier was single use and disposable.
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The tank would be going to a fellow brewer and is effectively a lifetime supply of oxygen for that purpose. So there would be no attempt made to refill it. I did receive it as a "gift" and I can say with assurance it is not stolen property.
I might see if I can contact the company. If they want to pick up the tank and offer a return fee that would suit me just fine. I am unable to transport it myself though.
Thank you for the advise so far and I welcome any additional comments.
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Well then sell it to him and be done with it. Empty welding tanks of that size go for $75 - $100. The Medical Regulators go for around $20-$40.
Note also that an endless supply of oxygen in low volumes can be obtained with a used oxygen concentrator for about $100-$200. Glass blowers and sculptors use those sometimes. I used to have two of them.. gave 'em away. "Not For Medical Use" despite it being a used medical appliance.