Check the listing for details. Victor Medalist Model 250-80-540 Medium Duty Oxygen Regulator. Condition: Used, Made in United States. Listed at 38.99 USD. The Victor Medalist Model 250-80-540 Medium Duty Oxygen Regulator is a high-quality gas regulator designed for welding and soldering applications. Made by the reputable brand VICTOR in the United States, this regulator is specifically compatible with oxygen gases. With a focus on durability and precision, this medium-duty regulator is an essential tool for professionals in the welding industry looking for reliable equipment to ensure smooth and efficient workflow.