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Installing a Grade Ring on a Traffic Style Flume Metering Manhole
Description
Contractor installing a grade ring on a H-20 traffic style Flume Metering Manhole. Grade rings help to transfer loads from the cover / frame to the manhole shoulder. They also raise the frame / cover to street level.
The manhole has a Palmer-Bowlus Flume factory installed - around which a bench (or shoulder) has been poured.