• Suitability for Heavy Traffic: The D400 certification and the 40-ton breaking load make it ideal for high-intensity traffic areas such as logistics hubs, ports, freight terminals, and national roads.
• Extra-Large Clear Opening: The 90x90 cm useful opening provides the necessary space for the safe descent of operators equipped with bulky tools or for the maintenance of large underground hydraulic valves.
• Fume Blocking: Thanks to the "U" groove that can be filled with sand or grease, the escape of gases and unpleasant odors is radically eliminated, to the total benefit of urban decor.
• Dynamic Stability and Safety: The automatic closure prevents the removal or lifting of the lid caused by the suction effect generated by the rapid passage of heavy vehicles.
• Non-Slip Grip: The special surface texture prevents tire slippage and pedestrian sliding in the presence of rain, ice, or mud.

The h638_159 model is the optimal solution for covering technological chambers and inspection pits located in high-traffic roadways, truck and bus parking lots, customs areas, industrial plants, and primary sewer networks. It is particularly requested by multi-utilities and public administrations for extraordinary maintenance interventions and new infrastructural developments.

Choosing this manhole cover means opting for the **maximum reliability of road engineering**. The structural mass of 124 kg in ductile iron guarantees excellent cushioning capacity against repeated impacts, reducing premature wear of the surrounding asphalt surface. It represents a strategic long-term investment that reduces repair and replacement costs, ensuring compliance with the strictest European regulations on heavy trafficability.

What is meant by load class D400?

Class D400, defined by the UNI EN 124 standard, identifies gully tops and manhole tops suitable for installation on the roadways of main roads, hard shoulders, and parking areas accessible to all types of vehicles, including heavy vehicles with high axle loads.

How is the odor seal configured with the "U" seat?

The "U" seat is a perimeter channel integrated into the frame. By reactivating or filling this groove with fine sand or equivalent sealing materials before inserting the lid, a blind mechanical joint is formed that prevents sewer gases from rising to the surface.

Is it possible to request customization of the lid?

Yes, on the upper surface there is a smooth space dedicated to customization. Upon request and for suitable order lots, it is possible to insert brands, company logos, or identifying text for the utility (e.g., Sewerage, Waterworks, Technological Networks).