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    Seal design also varies, with common designs being single-acting, double-acting, and U-cup sealshydraulic ram oil seals. The choice depends on the specific application requirements, such as pressure, speed, and duty cycle. Additionally, some advanced designs incorporate anti-extrusion rings to prevent seal deformation under high pressure.

    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).