The manhole covers in Ouranoupoli are made of metal or plastic (composite materials) , and their shapes are rectangular , round , or square .

In most cases, it is not known who the covers are intended for, and it is usually impossible to determine their specific function. In the few cases where it is known, the consumer’s name appears (ΟΑΘ - the sewage corporation) , or the cover’s purpose can be inferred from its design (for example: drainage slots) .

The city’s emblem does not appear on the covers.

In most cases, the covers are not particularly distinctive, typically featuring a background of squares or a pattern associated with a specific manufacturer .

Manufacturers
In most cases, the manufacturer’s name does not appear on the covers. In the few cases where it does, it is a Greek manufacturer: Viofre .

Standards
Standard marks usually do not appear on the covers. In the few cases where they do, the European standard EN124 and its corresponding load class (C250) are indicated .