I've got one, it's red and has "oxygen" stenciled on it. I figured it was steel, but never scrapped the paint off to look that close, probably is stainless.
It's not that convenient of a size, and having the fittings on the ends in the center gets in the way for a portable tank, which is what mine was used for at one time.
Now that I remember I have one I'll see if I can use it on my truck, if it fits. would need to mount it vertical or add a drain fitting to the bottom if it's flat.
Grigg
