The manufacturer’s manhole covers are made of metal and their shapes are rectangular , square , or round .
No colored or gilded covers were found, nor covers bearing city emblems.

In general, the cover’s purpose is not indicated, but communication covers can be identified by the text appearing on them (for example, CATV) or the name of the telecom provider , and drainage covers by their drainage slots .
The year of manufacture does not appear on the manufacturer’s covers.

Some covers display the manufacturer’s website address .

Standards
The British Kitemark standard appears on many covers .
The European standard EN124 and the associated load classes (D400, B125, A15) also appear.

Typical Covers
A background of square brackets is found on many covers by this manufacturer , as well as a background of small raised rectangles and a background of raised squares .
This manufacturer produces a wide variety of square drainage covers, with parallel slots , diagonal slots , or a matrix pattern .

Many covers are diagonal (square or rectangular covers composed of two triangles, with opening achieved by lifting one of the triangles) . There are 51 manhole covers in the site that are made by the Manufacturer
Click for the 51 covers made by Clark Drain (Of these, 0 are best covers)