Small Diameter Manholes

Small diameter manhole risers are available from 20″ Ø to 36″ Ø and are used for septic tank/cistern risers.  Bases in each size are also available to use for sanitary or storm applications.

Click on sizes below for pdf  Manhole Drawings.

Standard Small Diameter Manholes:

Grade Shims are available in 24″ Ø , 30″Ø , 36″Ø and 41″ Ø.







Other sizes and custom orders available upon request.  Call for more details 970-669-0535 or email to request a quote