Jacketed hose is designed for products with elevated temperatures such as sulfur. They have a media chamber surrounding a product chamber to keep the products warm or cold. The media typically is steam, hot oil, hot water or cold products such as liquid helium or nitrogen. Jacketed hose assemblies are generally used to heat fluids, which are normally viscous at 70°F. They use the jacketed section to carry steam or hot oil, to raise the temperature of the fluid moved in the internal hose, thereby lowering the viscosity and permitting uninterrupted material flow. It is made up of two flexible hose units, one inside another.