The manhole covers in Brussels are generally made of metal or concrete , but plastic (composite) covers also exist.
Their shapes include square , rectangular or round .
In many cases, round covers intended for sidewalks are surrounded by a square frame, which greatly simplifies the paving work around them .

No colored or gilded covers were found on the site, nor were any covers bearing the city’s emblem found in Brussels.
In general, no uniquely shaped covers or unique patterns were observed.

The purpose of the covers is often unknown. In cases where the function can be determined, water covers usually feature the word EAUX , electrical covers display a lightning icon or an earthing symbol , and gas covers feature the word GAZ or GAS .

Manufacturers
Most covers do not display the manufacturer’s details. On others, one can find the Belgian Hermelock and manufacturers from other countries, such as the French Norinco , the Spanish Fabregas and the American Erico .

Standards
The common standards are the European EN124 and its various load classes (B125-D400) .
Standards used in other countries can also be found (usually the home countries of the manufacturers): the Belgian COPRO , the French NF and the Spanish UNE .