Composed of modular circular-section elements with an internal wall in AISI 316L (EN 10088 Gr 1.4404) stainless steel and an external wall in AISI 304 (EN 10088 Gr 1.4301) stainless steel with a BA mirror finish. Insulation is provided by an intermediate layer of high-density rock wool. Each element is equipped with a male-female connection with a special seat for the insertion of a heat-resistant, triple-lip silicone gasket (upon request). Each component is joined by a special clip-on hose clamp with a safety hook, included.