Hoses are a flexible, hollow tube designed to move liquids from one location to another. Hoses are also sometimes called pipes (the word pipe usually refers to a rigid pipe, whereas a hose is usually flexible) or more generally pipes. The shape of a hose is usually cylindrical (it has a circular cross section).
Hose design is based on a combination of application and performance. Common factors are size, pressure rating, weight, length, straight tubing or coiled tubing, and chemical compatibility.
Applications often use nylon, polyurethane, polyethylene, PVC, or synthetic or natural rubbers, depending on the environment and the degree of pressure needed. In recent years, hoses can also be produced from special grade polyethylene (LDPE and especially LLDPE). Other hose materials include PTFE (Teflon), stainless steel and other metals.