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The metal typically used for manhole covers is cast iron. Cast iron is created by melting iron, which is poured into a mold. This process results in a strong and durable finished product. There are two main types of cast iron used to create precast manhole covers which include gray cast iron and ductile cast iron.

Applying a Sealant – One common manhole rehabilitation project includes applying a sealant to the manhole chimney. This process reduces the chance of frame-chimney inflow into the manhole.