It includes modular elements with circular section having 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 BA mirror polished finish. The insulation is ensured by an intermediate layer of high density rock wool. Each element is provided with ’male-female’ coupling and proper seat for the insertion of a triple lip heat resistant SILICONE SEAL (upon request). The connection of each element is ensured by a proper pipe clamp with security hook already included.