Single-piece, factory leak-tested manhole structures engineered for new installs and replacement sewer work—reducing lifecycle risk and accelerating construction.
Designed to help utilities and engineers reduce the long-term contingent liability costs associated with MIC-related repairs, coatings, rehabilitation, and premature replacements.
Click image to enlarge.
Concrete manholes deteriorate under wastewater exposure and require joints, gaskets, field assembly, and extensive testing. MagnaPLAST delivers a faster, lower-risk alternative with corrosion resistance inherent to the material.
Impervious to hydrogen sulfide gas and sulfuric acid formation—no specialized coatings required.
Monolithic assembly with factory QA/QC and certification—reducing field risk and inspection burden.
Lightweight design improves handling and delivery efficiency—ship more units per load vs traditional concrete sections.
Fabricated to specified structure depth in 0.10-foot increments with multiple inlet/outlet combinations.
Easily field-adjustable top elevation and straightforward custom penetrations when required.
H-20/HS-25 capable designs are available for roadway installations with appropriate top details.
Comparison of typical installation and lifecycle characteristics.
Click either image to enlarge (Old way vs New way).
| Category | Concrete Manhole | HDPE Manhole (MagnaPLAST) |
|---|---|---|
| Delivery | Multiple pieces; ~4 per truck | Single piece; ~8 per truck |
| Joints & gaskets | Requires multiple seals and joint interfaces | No structural joints or gaskets |
| Testing | Field testing and documentation required | Factory leak-tested and certified |
| Corrosion exposure | Susceptible to H2S attack; coatings often needed | Inherent corrosion resistance; no coatings required |
| Service life (typ.) | 5–40 years (varies widely) | ~100 years (typ.) |
Ask us for project-specific recommendations (depth, loading, groundwater, and backfill details).
We can support basis-of-design language and submittal packages for permitting and constructability.
Choose the top configuration method that best matches your site constraints and final grading control.
Installation/backfill approach should follow project geotech requirements and applicable standards.
Confirm details with your engineer/geotech for the specific site conditions.
Roadway designs vary—request a configuration aligned with owner standards.
Click any image to enlarge.
Factory configuration example.
Jobsite installation.
Traffic-ready top detail (example).
Share depth, loading, inlet/outlet geometry, groundwater, and backfill requirements—our team will recommend a MagnaPLAST configuration aligned with permitting and constructability.
A next-generation engineering and manufacturing company delivering innovative equipment and infrastructure products for the water, wastewater, and energy storage utility markets.