1.FRP Manhole Cover ,250mm~1200mm 2.Technics:SMC/BMC 3.Standards:EN124 4.Loading:A15 B125 C250 D400 5.With locking system ♦ Zibo Best Energy-saving Materials Co., Ltd. was established in 2004, which is one of the largest composite manhole cover manufacturer in China, specializing in producing and supplying composite materials(FRP/GRP) manhole cover, rain-grating ,tree-grating, flower pot, fence ...