This European Standard specifies requirements on and characteristics of bottom emptying devices on tank wagons used for the carriage of liquid substances of RID. This European Standard specifies the most important dimensions of connection devices for the emptying of the tank. Safety functions of these devices are subject to RID requirements and not described in this document. This European Standard is applicable to bottom vapour return devices where fitted to tank wagons. This European standard applies to new tank wagons built after the 1st January 2010.