• Permanent structural integrity: Compliance with class D400 certifies the capacity to support loads up to 40 tons, preventing cracks or breakages even under the continuous transit of heavy vehicles.
• Containment of sewer fumes: The internal "U" groove acts as a sealing barrier against underground gases when coupled with sand or insulating materials, preserving the healthiness of the surrounding environment.
• Immediate plant identification: The smooth space on the cover allows for customized casting of logos and text, facilitating the traceability of networks belonging to public entities or service companies.
• Optimal grip and drainage: The geometric reliefs uniformly distributed on the surface prevent vehicles and pedestrians from slipping, while simultaneously channeling rainwater towards the external flow channels.
• Silent interlocking stability: The combination of rounded corners and maximum seating depth eliminates horizontal movements of the cover, reducing noise pollution caused by passing wheels.

This manhole cover finds its natural application in modern road infrastructures and in primary urbanization projects with high intensity of use. It is specifically indicated for covering water, sewage, or cable duct inspection pits located on urban and extra-urban roads, emergency lanes, public parking lots, and industrial yards. Its technical configuration also allows it to be installed in areas of frequent maneuvering by commercial vehicles, such as gas stations and logistics loading docks.

Choosing the h638_155 model is correct when a compact square closing device (50x50 cm) is needed that does not compromise in terms of resistance to heavy loads. It represents the ideal investment compared to traditional grey iron because the ductile matrix of the material ensures flexibility and shock tolerance without cracking. It is the definitive technical solution for construction installers who require a self-centering slotted frame capable of speeding up installation operations and ensuring a permanent structural connection with the asphalt or concrete road surface.

Is the D400 load class suitable for installation on highways?

Yes, the D400 class is certified according to the EN 124 standard to withstand loads up to 40 tons and is the required standard for installation on high-traffic roads, including travel lanes and highway rest areas.

How is the odor seal achieved through the internal "U" seat?

To activate the anti-odor function, the "U" seat of the frame must be filled with fine sand or insulating gels before inserting the cover; the geometric compression creates an airtight joint that blocks the escape of gases from the pit.

What is the function of the closed-bottom slots on the cover?

The slots are used for the secure attachment of lifting keys during inspection. Being closed-bottom, they prevent liquids, dust, and small road debris from penetrating inside the sewer compartment, protecting the underlying systems.