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How to measure when ordering:

adjustable manhole riser measurement figure
1. Lid diameter
2. Lid thickness
3. Overlay thickness

Supplying us with the inside diameter of the original casting allows more precise factory assembly and minimizes field adjustment.

Manhole Adjustable Riser Co., Inc. will calculate all components needed and supply completely assembled risers, ready for field installation.

We recommend overlay be ¼" to ½" above riser for compaction and show blade damage.

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