The manufacturer’s manhole covers are made of metal or plastic (composite materials) and come in round , square , or oval shapes.

No colored or gilded covers have been found for this manufacturer.
City emblems also do not appear on the manufacturer’s covers.

In most cases, the cover’s purpose is not indicated. Drain covers can be identified by drainage slots or by the word DRAIN .

The year of manufacture is usually not marked.

Standards
The covers bear the British Kitemark standard as well as the European EN124 standard and its associated load classes (for example, B125) .

Typical Covers
The background of some covers features a diamond pattern (square covers or round ones ).
Other cover types appear at the bottom of this page. There are 8 manhole covers in the site that are made by the Manufacturer
Click for the 8 covers made by Osma (Of these, 0 are best covers)