Pre-owned. Refer to pictures. The Weldmark 250-80-640 Oxygen Gas Regulator is a pre-owned gas welding regulator designed for use with oxygen. Made by the brand Weldmark in the United States, this regulator is compatible with oxygen gas and is essential for controlling the flow of oxygen in welding and soldering processes. With its reliable brand reputation and specific compatibility with oxygen gas, this gas regulator provides a crucial accessory for precision welding and soldering tasks in various industrial settings.