Dimensions Clear Opening: 600mm x 450mm External Dimensions: 640 x 490mm Frame Depth: 25mm FACTA Class: AAA 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 The double seal is achieved by a unique captive O ring gasket under lateral compression in a specially designed lipped channel enhanced by the continuous surface of the cover at the corners. A second seal is achieved with an additional neoprene gasket vertically compressed in a channel. This double seal provides an enhanced level of resistance to gaseous and/or liquid ingress and /or egress under normal atmospheric pressure.