A square-like cover consisting of two triangular parts, so that it is opened by lifting one of the parts.
Photographer’s note: S N most likely denotes "Silent Knight" as found on almost all other diagonal covers manufactured and installed in Newfoundland. The cover was parallel with an identical cover as is common for one to connect to sanitary and the other to storm where sewer mains run side by side
The lid is similar to a manhole cover made by another manufacturer