• Excellent structural stability: The continuous perimeter flange and integrated reinforcements distribute the load evenly, preventing subsidence of the surrounding road surface.
• Odor-tightness against miasmas: The "U" seat allows for the creation of a seal against odors, improving the healthiness of the surrounding environment, especially in residential areas.
• Road safety: The uniform non-slip reliefs maximize grip for tires and pedestrians, while facilitating the correct flow of rainwater.
• Protection and quietness: Locking via bolts prevents unauthorized opening and drastically reduces rattling noise when vehicles pass.
• Ease of inspection: The blind-bottom slots protect the lifting key attachment point from debris, ensuring rapid opening during maintenance.

The use of the h638_138 manhole cover is specific for main road carriageways, stopping areas and parking lots accessible to all types of road vehicles, including heavy ones. It is the standard solution for closing sewer manholes, water networks and technological sub-services located in densely trafficked urban contexts. Its robustness and ISO 9001 compliance also make it suitable for industrial areas and port docks, where dynamic stresses and exposure to atmospheric agents are particularly severe.

Choosing this manhole cover is the right decision when superior mechanical anchoring is required, guaranteed by the holes for anchor bolts and the maximum interlocking depth of the lid. It is preferable to light lamellar iron models for its high resilience and impact resistance typical of ductile iron. It represents the ideal choice for administrations and companies looking for a product certified ISO 9001:2015, capable of combining ease of installation, watertightness and reduction of road maintenance costs over time.

What is meant by odor-tight seal in a square manhole cover?

The seal is guaranteed by a "U" shaped groove present inside the frame. By filling this seat with sand or suitable grease, a physical barrier is created that prevents foul-smelling gases from the sewer network from escaping at road level.

What is the advantage of bolt fastening in Class D400?

Mechanical fastening ensures that the lid remains perfectly integral with the frame even under strong vibrations or sudden braking by heavy vehicles. Furthermore, it acts as a deterrent against lid theft and prevents accidents caused by accidental lifting.

Is it possible to request customization with the owner entity’s logo?

Yes, the lid includes a dedicated space for inserting logos, inscriptions or identifying emblems, allowing for easy distinction of the type of sub-service (e.g. Aqueduct, Sewer) and the management entity.