This International Standard specifies the minimum requirements for mono wall and multilayer tubing used in air braking systems on road vehicles. The conformity of production is the responsibility of the tubing manufacturer. The marking of the tubing does not automatically imply that the tube assembly (i.e. tube with end fittings) is appropriate for its use on a vehicle.It is the responsibility of the tube assembler and/or the vehicle manufacturers to ensure that the tests described in Annex B, relating to the tube assembly itself, are successfully performed. For the requirements on coiled tube assemblies refer to ISO 7375-1 and ISO 7375-2.