Took a picture of the neck. It does have a raised air products logo on the same bit as the 300bar, just in shot. The valve also has the Air products logo stamped into it.
Peter

I think it's pretty unlikely that it is stolen. I completely forgot to ask the seller anything about the bottle, focusing on the welder, I wouldn't have bothered hauling it back if it was empty. I read somewhere, probably about propane bottles, that if they've been near horizontal a safety valve mig...

Thanks very much chaps, liking this forum already! I've been looking at lots of argon regulators on the net and can't see any that look like they'd be able to depress this valve. It seems like there's a lot of gas in there so I'd be very happy if someone could point me in the direction of one. Or do...

Thanks for your quick reply! I see, so the gas that escapes when I press that button is just to keep the cylinder from filling up with normal air? I'm just surprised because there's a big rush, hurt my ears!
Thanks again, Peter.

Hi chaps, wondering if someone could advise me here. I bought a used Cebora 160 ac/dc tig welder on eBay, included in the sale was a large air products argon gas bottle. I connected the old looking regulator with flow meter up to it and turned the tap, nothing. I've never dealt with gas bottles befo...