... .10 years experience 4.A15,B125,C250,D400 composit manhole cover Features(1) Environmental protectionWith raw material non-toxicity, it ... of compound manhole cover is lower than stipulated standard cast iron ones;(5) Light weightThe weight is 1/3 lighter than cast ... working intensity;(6) Nice appearanceOutstanding dying, rich colors; the cover is not sprayed in surface but painted in whole material ...