Hey guys new guy here. Tried joining different welding forums but for whatever reason they kept saying I was a robot. My question is I just acquired through a friend a set of Harris oxy/acetelyn regulators. They each have only one gauge each. The port I’m assuming is the input has what appears to be a connection for a bottle. On the oxygen regulator on the back it says 350psi max inlet pressure. I know oxygen bottle pressure is way beyond that. Can I use these regulators directly off the bottles? If not what are they used for? I’ll try and get a picture up.