Prima PCH 02 - 8mm Rubber Hose Pipe Oxigen/DA - They are used for industrial gas cutting welding hose pipes used for acetylene and oxygen. They come under the category of superior rubber welding hose. They are mainly used for welding, cutting and allied processes. The inner tube is made up of gas oil resistant synthetic rubber. It has a single layer braid high tensile strength steel wire hose for reinforcement purpose. The outer cover is made up of abrasion-resistant synthetic rubber. The red colour code is used for acetylene or other fuel gases, blue and green colour hose is used for oxygen.