Our maintenance hole (MH) frames and covers are engineered to meet the rigorous demands of modern infrastructure systems. These systems include sanitary sewers, stormwater networks, combined sewer systems, and potable water distribution networks. These components play a critical role in providing safe, reliable, and durable access to underground utilities. Additionally, they ensure system integrity and surface-level performance.
We offer a wide range of frame and cover designs:
Self-leveling assemblies – allow for vertical and angular adjustments to align with road surfaces during installation or pavement resurfacing. This helps reduce stress on the frame and improves load distribution. Furthermore, it minimizes long-term maintenance caused by road settlement or freeze-thaw cycles.
Watertight covers – are ideal for applications where infiltration or exfiltration must be prevented. This is particularly important in sanitary sewer systems where inflow and infiltration (I&I) can overwhelm treatment plants. Such conditions increase operational costs. These covers utilize gaskets, mechanical seals, or bolted configurations to ensure a secure, leak-resistant seal. They also meet applicable municipal and ASTM standards.
Perforated covers – typically used in stormwater applications where surface runoff needs to be directed into the stormwater collection system. These covers are designed with strategic openings that allow water ingress. They maintain structural integrity and prevent debris from clogging the system.
Low-profile covers and frames are available for applications with space or clearance constraints, such as urban settings, pedestrian pathways, or landscaped areas. Despite their reduced height, these components are engineered to maintain full load ratings. For example, AASHTO H20/H25. These components also resist corrosion, deformation, and environmental degradation.
All our maintenance hole solutions are manufactured with high-quality materials such as cast iron, ductile iron, or composite materials. They are available in various sizes and configurations to meet municipal, industrial, and commercial project specifications.