Dimensions Clear Opening: 450 x 450mm External Dimensions: 495 x 495mm Frame Depth: 25mm FACTA Class: A Description These pressed mild steel covers are available in a comprehensive range of sizes and weight loadings. Galvanised to BS EN ISO 1461, this range provides a cost effective solution for infrequent and slow moving traffic situations. Our pressed steel covers are available in a comprehensive range of sizes and weight loadings and a choice of steel or polypropylene frames. They are suitable for infrequent and slow moving traffic situations. The surface pattern is designed to avoid water pooling. The notchless die-drawn corners on Wrekin pressed tops gives the following benefits: No sharp exposed edges No cut exposed edges improve corrosion resistance Continuous surface seal “ better for avoiding water ingress and odours Single seal is achieved by a simple labyrinth arrangement enhanced by the continuous surface of the cover at the corners. The labyrinth can be filled with grease providing a low to moderate level of resistance to gaseous and/or liquid ingress and/or egress under normal atmospheric pressure. If a better resistance is required a double seal should be considere.