5" (125mm) Stove Pipe Elbow 45 degree angles. These elbows are used to change the direction of the flue. Dura Stove Pipe offer a comprehensive range of matt black vitreous enamelled flue pipe. Manufactured in accordance with ISO9001-2008 using low carbon steel, 1 mm thick. Suitable for oil, gas and Solid Fuels, for domestic heating appliances. Finished products have an internal and external vitreous enamel coating to offer extremely high resistance to heat and toxic or corrosive gasses meeting with the requirements of BSEN ISO 28706 – 1:2011.