The manhole covers in Istanbul are made of metal
and are circular
, rectangular
, or square
.
No colored or gilded manhole covers were found in Istanbul, nor were any covers bearing the citys emblem.
The purpose of a cover is indicated as follows: the name of the telecommunications provider on telecommunications covers
, the word GAZ on gas covers
, and drainage slots on drainage covers
.
The year of manufacture is generally not indicated.
Manufacturers The manufacturers names do not appear on the manhole covers featured on this site.
Standards The international EN124 standard
and its associated load class (D400)
appear on some of the manhole covers.