A series of light weight, extremely strong and corrosion proof
polymer rings that replace the heavy, labor-intensive and sometimes
dangerous concrete grade rings used to support manhole frames and covers
PRO-RINGS are easily combined to bring the cover within one quarter
inch of grade.
They install so quickly that fewer men can do the work
in a
fraction of the time, and can work more safely due to
the
elimination of the need for heavy but fragile concrete grade rings. |
