Sewer manhole cover - the cover that closes the manhole cover, keep out foreign objects into the sewer system, and also serves to prevent accidents.

Manhole covers usually weigh 50 kg or more, so they could not be shifted to hatch even when heavy traffic. They are made of cast iron, sometimes going into the iron structure filled with concrete. The cover is usually a small hole in which to insert the special hook to pick it up. In Russia, due to the fact that the cast iron manhole covers are often stolen in order to pass them in reception centers scrap metal manhole covers are sometimes made entirely of concrete. Also to this end, cast iron manholes are gradually being replaced with plastic.

World leader in the manufacture of covers for manholes is India

Despite the fact that the caps themselves are quite heavy, they collect. Also, many are engaged in collecting photos of covers with various designs and inscriptions around the world.

Andrey Dre @ mer