30x42x7 oil seal

A manhole cover makes it easy for workers to remove then and enter the manhole to carry out trenchless rehabilitation by utilizing methods such as cured-in-place pipe (CIPP), thermoformed pipe and mechanical spot repair. A manhole can also be used to carry out trenchless inspection in order to find out problematic areas that can then be isolated and repaired. A manhole cover is made with different materials such as cast iron, ductile iron, concrete and in some cases, with glass reinforced plastic (GRP).