The HellermannTyton 309-21903 Heat Shrinkable Tubing is a 2:1 flexible orange tubing with an inner diameter of19.0 mm and an outer diameter of 9.5 mm. This tubing uses a heat-shrink process to fit around parts, providing an air and watertight seal. It is designed for use in the automotive, electronic, and industrial industries. It is suitable for insulating and protecting components, harness assemblies, metal parts, and cable insulation. It is flame retardant and oil and petrol resistant. The tubing temperature rating is -55°C to 135°C.