Is that fleabay #120827258722 by any chance? So yeah, as long as you know you'll need to get a CGA#320 nut/ nipple on there. . . it looks like a winner to me!
It is a little odd, I don't know that I've ever seen a reg with a left-to-right configuration before; but I don't see why that would be an issue. I'm wondering if this was for a medical application or something (?).