Manhole Cover Manhole cover: composite materials, artistic, theftproof. long working life, abrasion resistance Manhole ... B125, C250 ,D400We could make BMC, SMC, FRP Composite with Manhole cover: composite materials, artistic, theftproof long working life, abrasion resistance etc ... Qingdao Benor Machinery CO.,LTDWe are the manufacture of Manhole Cover for more than 15 years.The standard is according to ...