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Lifting keys will be used in pulling manhole covers to make it easier. Since it is your hand and back that will take the risk of doing it, proper way to do it should be known.

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]

The Importance of Gate Valves in Various Industries

Manhole covers may also be made from glass-reinforced plastic or other composite material (especially in Europe, or where cover theft is of concern). Because of law restricting acceptable manual handling weights, Europe has seen a move towards lighter weight composite manhole cover materials, which also have the benefits of greater slip resistance and electrical insulating properties.

(iii) Base Preparation: Once the excavation is complete, the base of the manhole is prepared. It typically involves leveling and compacting the soil or adding a layer of granular material like crushed stone or gravel to create a stable foundation.