Get Better Grades on Your Manholes

Adjustable rings install easily and match road crown for a smoother surface

Get Better Grades on Your Manholes

The City of St. Charles, Missouri, installs about 80 American Highway Products manhole risers annually.

When a manhole lid isn’t flush with the road surface, you know it. Everyone who drives that road knows it.

Setting lids flush with the road surface and maintaining them at grade through years of traffic and road maintenance is a challenge every wastewater utility faces. Flat or...

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