Square frame ductile cast iron manhole cover D400, indicating that the load is 400 kN, equivalent to the maximum load of 40 tons. Here are the details of the manhole cover: 1. Material: The use of ductile cast iron, has good ductility and pressure resistance, so it has strong pressure resistance, will not be crushed, no cracks. 2. Design: The manhole cover is round, and the well holder is square, so that the manhole cover has better stability and is not easy to shift.Well seat and cover integrated design, not only easy to install, and not easy to steal. In addition, the small square design raised on the surface of the ductile cast iron manhole cover plays a non-slip role, so that pedestrians are not easy to fall. 3. Size: This ductile cast iron manhole cover is 850mm*850mm size, but our company can customize various sizes and patterns according to customer needs.

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