Look at the appearance of rubber hose pipe: rubber appearance is generally divided into two kinds, smooth surface and cloth surface. The smooth surface requires external lubrication, no bubbles and bulges; cloth grain surface requires flat, common distance around the cloth.
See reinforcing layer: reinforcing layer is generally surrounded by fibres and steel wires. The more layers there are, the greater the pressure they will accept. This is an important goal of discrimination.
See if there is migration in rubber hose: normally, Rubber Hose core is round, if it is oval or not, it may affect the use of Rubber Hose.
Look at the winding function of rubber hose: half of the hose is winding. Investigation of the appearance colour and spring back speed shows that the colour change is small and the spring back speed is fast, which proves that the quality of hose is better.