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The types of cast iron manhole covers and frames can be differentiated on the basis of grades i.e., light-duty, medium-duty, heavy-duty & extra heavy-duty, & shapes like circular, rectangular, square &lamphole.
Posted by Tradeindia user (07-10-2020)
Cast iron manhole covers are removable lid covers for the opening of the manhole. They prevent unauthorized persons & unwanted material from falling in. These are flat in shape.