bought a torch & regulators from a coworker a couple of years ago for $50,they looked to be in good shape & quality.finally decided to rent the tanks & try it out.imagine my surprise when i tried to connect the oxygen regulator to the tank only to find they both had external threads ! i brought the whole setup back to the local welding supply house to let them check it out.seems a nitrogen fitting had been installed on the regulator,but this was indeed an oxygen regulator.they changed out the fitting to the correct one,tested both regulators & torch (which needed a couple of o-rings) while i waited ! i can't say enough about dealing with the local small business.purchased new hoses,a new torch tip & a couple of quick disconnect/check valves to show my appreciation.tried it out yesterday afternoon,works perfect.guess that's why i got it at such a good price [img]/forums/images/icons/wink.gif[/img] revg62