1- No recovery value- it will solve the manhole cover stolen problem thoroughly.
2- High load capacity –its high load capacity exceeds the ductile iron .
3- Free design –It can be designed according to users’ demand ,including color, pattern, specification .
4 – Long service life –it can be used more than 30 years and there is no any crack in the experiment of 2,000,000 fatigue shocks .
5- Well sealed- it can be used hermetically and effectively prevent those poisonous gases leaking out from cesspool .
6- No any jangle –there is neither jangle nor rebound when cares pass through .
7- Good wear and corrosion resistance – it will never rusts because it has wear and corrosion .
ance