Standard Size Manholes

The standard inside diameters are 4, 5, 6, 8, 10 and 12 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: Please contact a sales rep for info on our NEW 12′Ø manhole form.

All available components for 4′ Ø to 10′ Ø pdf