The covering of a manhole serves as a plug to keep away unwanted visitors. Manhole covers can be circular, square, or rectangular, and they have perforations that allow gases to escape. The material of a manhole and cover can be precast concrete, composite, fibreglass, iron, concrete, or glass-reinforced plastic. The material of the manhole and cover also dictates their longevity. Manholes are most commonly found in locations where two or more sewer lines form a junction, locations where a change in the sewer line is necessary, and a change in sewer size and alignment. Precast concrete manholes are the most durable and last the longest, making them the most popular option. We offer a small selection of heavy-duty pedestrian manhole covers and frames. Our range comprises of covers seal and lock, and we also stock a precast concrete inspection chamber.