A special German standard of the German Institute for Standardization () for square covers (sewage and the like) on roads that defines the requirements for covers in the C250 () D400 () load class. This standard defines the size, the materials and the weight in which the lid should withstand in order to the load.
The standard title is: Gully tops 500 × 500 for road gullies, class C 250 and class D 400
An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.
A special German standard of the German Institute for Standardization (
) for square covers (sewage and the like) on roads that defines the requirements for covers in the C250 (
) D400 (
) load class. This standard defines the size, the materials and the weight in which the lid should withstand in order to the load. 
Hungary (1)
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