Water Tight Manhole Cover

Low-lying road drains and underground garage drainage systems face two major water-related challenges. Heavy rain can drive surface water through small gaps into the chamber, which may overload the drainage system.

High water levels inside the chamber can also create upward pressure and push wastewater toward the road surface. Our Dingjian Watertight Manhole Cover prevents water intrusion from both directions.

It uses a multi-layer rubber sealing system. The size is Φ730 with overall dimensions of 380 × 680 millimeters. The product meets the D400 load rating with a capacity of 400 kN, making it suitable for main roads and heavy traffic areas.

The multi-layer rubber sealing system is the core feature of this watertight manhole cover. We install multiple sealing rings at different depths, and each layer performs a specific function.

The outer ring prevents surface water from entering the chamber. The middle ring provides dynamic sealing performance when vehicles pass over the cover. The inner ring helps prevent internal water pressure from pushing upward during high water conditions.

All three sealing layers work together as one protection system. Even during heavy rainfall, the cover maintains reliable sealing performance and helps reduce the risk of flooding and overflow.

This product features an anti-settlement frame design. The frame uses a wide flange structure to increase contact with the road surface.

The design helps accommodate minor road settlement and keeps the cover level with the surrounding pavement. It prevents uneven height differences that may cause bumps or sinking.

The one-piece structure creates smaller gaps between the cover and frame, further improving sealing performance.

Made from high-grade ductile iron, the product provides strong impact resistance and corrosion resistance for long-term use under heavy traffic conditions.