Flexible hose is a versatile conduit designed to transport fluids, gases, or granular materials while allowing movement, vibration, and misalignment between connected components. Unlike rigid pipe, it can bend, flex, and accommodate dynamic conditions, making it essential in many industrial, commercial, and domestic applications.A flexible hose typically consists of an inner tube, reinforcement layer, and outer cover. The inner tube is selected according to the medium to be conveyed, such as water, oil, air, steam, chemicals, or food products. Common inner tube materials include synthetic rubber, thermoplastic compounds, and fluoropolymers, which provide resistance to temperature, pressure, and chemical attack. The reinforcement layer, often made of textile braid, wire braid, or spiral-wound steel, gives the hose its pressure-bearing capability and controls expansion under load. The outer cover protects against abrasion, weathering, ozone, oil, and other environmental factors.There are several main categories of flexible hose, each designed for specific working conditions. Rubber hoses are widely used for water, air, and general industrial services, valued for their flexibility and durability. Thermoplastic hoses are lighter and often offer superior chemical resistance and lower permeability. Metal hoses, typically made of corrugated stainless steel with external braid, are used in high-temperature, high‑pressure, or corrosive environments and provide excellent fire and abrasion resistance. Composite hoses, made from multiple layers of films and fabrics with an inner and outer wire helix, are commonly used for chemical and petroleum transfer where both flexibility and chemical compatibility are required.Key performance parameters for flexible hose include working pressure, burst pressure, temperature range, bend radius, and compatibility with the conveyed medium. The minimum bend radius is particularly important, as exceeding it can lead to kinking, reduced flow, and early failure. Hose selection must also consider end fittings, which may be crimped, swaged, or clamped. Properly matched fittings and correct assembly are critical to ensuring a leak‑free and reliable connection.Flexible hose is used in hydraulic systems, pneumatic tools, fuel and lubricant transfer, cooling and heating circuits, food and beverage processing, fire protection, and many other fields. In mobile equipment, it connects moving components such as cylinders and motors; in process plants, it compensates for thermal expansion, vibration, and misalignment; in building services, it connects pumps, chillers, and sanitary fixtures where rigid piping would be impractical.Safe operation of flexible hose requires correct selection, installation, and maintenance. Hoses should be protected from twisting, excessive bending, abrasion, and external heat sources. Regular inspection for cracks, blisters, leaks, and damage to the cover or fittings helps prevent failures. By combining appropriate materials, construction, and design, flexible hose provides an efficient, adaptable, and reliable solution for fluid and gas transfer across a wide range of industries and operating conditions.