This European Standard applies to manholes on tank wagons used for the transport of dangerous substances. This European Standard specifies the dimensions for the interchangeability of seals and other wearing parts and defines also the important dimensions for: — manholes for gas tank wagons located in one end of the tank; — manholes for gas tank wagons located on the top of the tank including the arrangement of fittings; — bolted manholes for tank wagons for liquid substances located on the top of the tank; — swing bolt manholes for tank wagons for liquid substances located on the top of the tank.