Standard Size Manholes
The standard inside diameters are 4, 5, 6, 8 and 10 foot. Our manholes meet ASTM C-478 Specifications for Precast Reinforced Concrete Manhole Sections.
We have a large inventory of standard 
manhole sections, or we can cast them with gaskets or blockouts as needed. Invert channels may be added for sanitary sewer lines.
Manholes are also available with
a variety of coatings to meet your specifications.
Click on sizes below for pdf Manhole Drawings.
Precast invert poured in manhole base.
Manhole with custom blockouts.
Standard Inside Diameter Manholes:
