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Need following items:-Frame and cover for manholes and gratings shall be gray cast iron, ASTM A 48, Class 35B. - for water chamber- size 600 x 600 - square opening, heavy duty 40ton, water tight-03 nosFrame and cover for manholes and gratings shall be gray cast iron, ASTM A 48, Class 35B. - for sewage - Round opening 600mm dia with square frame , heavy duty 40 ton -09 nos