A flexible rubber hose used for conveying liquids, viscous fluids, and powdered solid materials, the jacketed hose consists of an inner rubber layer, multiple layers of woven or twisted fabric reinforcement, and an outer rubber layer. Some models are reinforced with spiral steel wire. Its structure can be divided into inner rubber layer + intermediate skeletal reinforcement layer + outer rubber layer, with the jacketed layer in the form of woven layers, twisted layers, and spiral steel wire layers. It features small outer diameter tolerance, oil resistance, heat resistance, and wear resistance, with the minimum bursting pressure being four times the working pressure.