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The pipe - a long hollow, usually roundish object, article of manufacture on the basis of the hollow profile of constant section for wires liquids, fluids, gas, steam and so on.
Pipes are produced by industrial methods, and alloys of metals, organic materials (plastics, resins), concrete, ceramics, glass, wood, and combinations thereof.
In commercial scale pipe is used for transporting various media, insulation, reinforcement, or groups of electrical wires. Metal pipe is widely used in construction as a structural element (eg, metal) or mechanical (eg shaft - item for the transmission of rotation).