That machine was built for Airco by Esab. I would contact them. I am not sure who presently ownes the rights to the Airco machines, but at least a few of the ones Airco sold are still in the Esab line. I don't know if Esab bought Airco, or if they just built machines for them. Esab owns all the Union Carbide brand names of welding equiptment, Linde, L-tec, Prestolite, Purox, Oxweld & the Heliarc tradename, etc. The package buisiness from BOC [Airco] is presently owned by Airgas. Airco's line of regulators and torches is available from Concoa.