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Maintenance Holes

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Concrete maintenance holes are available in two basic shapes: circular and rectangular. Rectangular structures are discussed in our Utility Chamber and Monobox MH pages. Circular maintenance holes are available in nominal inside diameters of 1200mm, 1500mm, 1800mm, 2400mm, 3000mm, and 3600mm. The standard depth of bury for precast maintenance holes are 10m to the base, but designs for deeper applications or different live load conditions are available. The standard riser section heights are available in 300mm increments. Each circular MH section is supplied with a single offset joint and a pre-lubricated rubber gasket.


  • Not as dependent on the pipe-soil interaction for its structural strength, therefore is not as installation sensitive as other MH materials
  • Available in countless configurations, such as prebenched, precast drop structures, and flexible pipe-to-MH connectors

Contact us today to place your next project on the strongest possible foundations.


Thank you for your interest.