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Manhole cover theft can be a serious problem in China, where missing manhole covers caused at least eight deaths in 2004.^[20] According to China's Xinhua News Agency, about 240,000 manhole and street-drain covers were stolen in Beijing in 2004.^[21]

Cast Iron Manhole Cover is cast out of gray cast iron. As ductile cast iron is higher in strength, it is used for manholes that are supposed to take heavy loads ( Airport areas). The gray cast iron used for manhole cover manufacture is a combination of carbon and silicon. The carbon gives strength and durability to the element. The addition of manganese to the molten iron gives ductile cast iron.

4. Ease of Operation Most telescopic security posts are designed for user-friendly operation. Whether operated manually or electronically, they can be raised and lowered quickly, ensuring that security personnel can respond promptly to any situation that arises. Additionally, certain models can be integrated with access control systems, enhancing their functionality and operational efficiency.

Maintenance is also simplified with recessed covers. Cleaning urban infrastructure is necessary to maintain public health and aesthetic standards. With recessed designs, dirt and debris tend to accumulate less around the cover, making it easier for maintenance crews to perform their duties without extensive cleaning.