• Maximum Strength and Load Capacity (D400): Certified to withstand impact loads up to 40 tons, it tolerates the continuous and fast transit of trucks, buses, cars, and emergency vehicles without damage.
• Advanced Mechanical Closure: The system with an elastic appendage and locking lug prevents the cover from lifting due to road vibrations or the suction effect generated by the rapid passage of vehicles.
• Infallible Structural Anchoring: The perimeter flange reinforced by ribs uniformly distributes stresses onto the concrete casting, while the provision for anchor bolts prevents sinking or cracks in the surrounding asphalt.
• Pedestrian and Vehicular Safety: The special texture with anti-slip reliefs guarantees excellent grip, favoring the complete runoff of surface water and avoiding skidding in case of rain or ice.
• Guided and Unique Inspection: The surface grooves and calibrated interlocking force the cover to align perfectly in its seat at every closure, guaranteeing impeccable road flatness and eliminating noisy wobbling.

The h638_173 model is the optimal technical response for the covering and inspection of technological chambers, sewage networks, water nodes, and road utility systems. It finds its perfect placement in high-traffic urban and extra-urban roads, ordinary traffic lanes, logistics squares, industrial areas, service stations, and public parking lots accessible to all types of road vehicles.

Choosing this manhole cover means opting for a road component that is **stable, safe, and fully compliant with strict European regulations**. Thanks to the physical and elastic properties of GJS 500-7 ductile iron, the h638_173 model offers extraordinary longevity and resistance to mechanical shocks compared to old gray iron manhole covers of higher weight. The closed-bottom slots allow for agile lifting with standard equipment, while preventing soil and debris from filtering into the pit. It is the definitive solution for public bodies, utilities, and construction companies that demand high structural standards and zero post-installation maintenance costs.

What is meant by load class D400?

Class D400, defined by the European standard UNI EN 124, identifies crowning devices suitable for installation on the carriageways of main roads, road shoulders, and parking areas accessible to all types of road vehicles, including heavy vehicles with high axle loads (test load exceeding 400 kN).

Is a special or proprietary key required to unlock the closure?

No. The mechanical snap system is designed to be unlocked by inserting a common construction site lever (or a standard crowbar) into the dedicated slot, optimizing the intervention times of technical teams and guaranteeing immediate accessibility.

Do the lifting key slots allow rainwater into the pit?

No. The "closed bottom" characteristic indicates that the slots are internally isolated from the rest of the structure: they allow for the solid attachment of lifting hooks but prevent soil, road debris, or water from filtering inside the pit below.

Is it possible to mechanically fix the frame to the concrete base?

Certainly. The external perimeter flange of the frame is provided with slotted holes specifically designed for the insertion of anchor bolts or mechanical plugs, guaranteeing a rigid and solid fastening to the structure below.

How can I request customization with my company or Municipality logo?

On the upper surface of the cover, there is a specifically prepared smooth geometric space. Customization with inscriptions, utility codes (e.g., Aqueduct, Sewer, Telecommunications), or logos can be requested during the quote and ordering phase, subject to technical feasibility check and minimum order quantities.