The double hose for welding , cutting and other related processes is an essential accessory for working with fuel gases and oxygen . This hose is made up of two synthetic rubber tubes, one orange (propane) and the other blue (oxygen), which are joined by a textile band. The orange tube conducts the fuel gas and the blue tube conducts the oxygen. The double hose has resistance to pressure, heat and abrasion, and complies with current safety standards (ISO3821). Available from 6 mm, 8 mm and 10 mm)