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manhole cover
grating
Shu wai
Water drainage system
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manhole cover
grating
Shu wai
Water drainage system



Light Manhole Cover：
It can be used in greenbelt, where the passage of motor veicycle is forbidden, proch, cycleway and pavement．
Normal Manhole Cover：
It can be used in road, where the passage of motor veicycle whose load is less than 10 tons is permitted, and park.
Heavy Manhole Cover：
It can be used in road, where the passage of most motor veicycle is permitted ,and park．
Extra-heavy Manhole Cover：
It can be used in main road, and park for truck or lorry．
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