manhole cover Made of SMC or BMC composite meterial envirnomental and safe Product name:Manhole Cover.Brand Name:Dengrui.Size:700*50mm.Cover Diameter:700mmCover ... water,drainage pipe well, heat supplied, gas well4,Round SMC Manhole Cover&Circle BMC manhole covers&resin fiberglass covers&Molded resin covers&molded polymer ... available in custom width,safe, embossing option available, BMC manhole cover