The manufacturer’s covers are made of metal and come in rectangular , square , or circular shapes (very few covers) .
No colored or gilded covers from this manufacturer were found, nor any covers with city emblems.
It is difficult to determine the purpose of a cover, except for drainage covers (with drainage slots) , communication covers (CATV) , fire hydrants , and others.
On certain covers the year of manufacture appears
Standards Most covers are produced according to the British Kitemark standard , and some according to the British standards BS497 and BS5834 . The European standard EN124 and its associated load classes are found on many covers, with the most common load classes being B125 and D400 .
Typical Covers Many covers feature a background of three parallel lines forming squares , while others feature a background pattern resembling the letter V in alternating directions . The manufacturer produces a wide range of drainage covers with various slot designs .
Many covers are diagonal (square or rectangular covers divided into two triangles, opened by lifting one of the triangles) .