With their closed pitch corrugated structure, Mig-gas hoses provide a highly flexible and extensible connection for all kitchen appliances. It can be manufactured with or without polyolefin based cover. Mig-flex hoses are exposed to special heat treatment. Heat Treatment eliminates the stresses caused by the tubing, mechanic forming and fitting welding processes and increases the flexibility as well as the corrosion resistance of hoses while reducing the spring rate accordingly. Heat treatment helps hose to save the form and the shape given.