450 by 450 Mm Manhole Cover

They are designed to cover manholes, protecting plumbing/drainage systems and preventing access. Modern covers are often made from durable materials like ductile iron or polysynthetic composites that resist corrosion. They are available in various sizes and load capacities (e.g., 1.5, 5, or more tonnes) to suit different traffic areas. Some composite versions are lightweight for easy handling and have no scrap value, which deters theft.