Plastic Manhole Cover Manhole cover: composite materials, artistic, theftproof. long working life, abrasion resistance Plastic Manhole CoverTheftproof artistic manhole coverROUND TYPECover size:diameter 500mm, 600mm, 700mm , 750mm.Load ability: A15, B125, C250 ,D400We could make BMC, SMC, FRP Composite with Manhole cover: composite materials, artistic, theftproof long working life, abrasion ...