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- Remove the manhole Cover.
- Clean the manhole rim or flange of any dirt or debris to insure
accurate measurements.
- Locate the CLEAR OPENING of the manhole diameter measurement (I.D.)
shown above. Take two or three readings along the I.D. and record the
smallest measurement to the nearest eighth of an inch.
- Locate the outer edge of the manhole rim. This is the O.D.
measurement. Take two or three readings along the O.D. circumference
and record the smallest measurement to the nearest eighth of an inch.
- Provide web information (A & B) as cover above.
- Please indicate the specific type of manhole frame and cover that
you have along with the name of the foundry and the number if
possible.
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