A manhole cover or maintenance hole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in. Manhole covers date back at least to the era of ancient Rome, which had sewer grates made from stone.
Manhole covers are often made out of cast iron, concrete or a combination of the two. This makes them strong, The heavy weight helps to keep them in place when traffic passes over them, and makes it difficult for unauthorized people without suitable tools to remove them.
Manhole covers may also be made from glass-reinforced plastic or other composite material (where cover theft is of concern). For ease of manual handling weights, Demand move towards lighter weight composite manhole cover materials, which also have the benefits of greater slip resistance and can take load of Vehicles has per design load class.
Despite their weight and cumbersome nature, manhole covers are sometimes stolen, usually for resale as scrap, so that alternative material demand increased and FRP or (glass-reinforced plastic or other composite material ) Manhole Covers became popular.
Everlast FRP Manhole Covers with Full Range of Size and Load class available.