Rubber tube is a tube for gas conveying, which is commonly used in gas welding, gas cutting, various gas protection welding, plasma arc welding and cutting. There are two types of rubber pipes for welding. According to the national standard blue tube as the oxygen pipe, the maximum use pressure is 1.5MPa; the red tube or the black tube is a acetylene tube, which allows the use of pressure to be 0.5 ~ i.MPa. Difficulty, voltage resistance, conductivity and other performance.