... to 25-60 ton based on size ,complies with requirements of EN124;A15;B125;C250;C400wafery edge design,can match the cast iron frame ... pipe well, heat supplied, gas well4,Round SMC Manhole Cover&Circle BMC manhole covers&resin fiberglass covers&Molded resin covers& ... polymer cover&water grate5,trench covers, manhole sets, well base, the water company covers, midori composite trench covers easy to handle, ...