1.Environmental protection

 With raw material non-toxicity, it will not influence to user;

2.Longevity

 Acid and alkali corrosion resistance; Anti-rust; insulation; anti-abrasion; weatherability; excellent anti-pressure  capability;

3.Competitive price

 The price of compound manhole cover is lower than stipulated standard cast iron ones;

4.Light weight

 The weight is 1/3 lighter than cast iron ones so that it is convenient to transport, install, rush repair; construct easily and reduce working intensity;

5.Nice appearance

 Outstanding dying, rich colors; the cover is not sprayed in surface but painted in whole material so that the color can keep lasted; With clean, smooth surface,  it will be consistent with the lawn or ground, beautiful and functional;

6.Anti-theft

 Non-recycle material, anti-theft naturally; the lock attachment can prevent tunnel products from losing, therefore city blackhole can be stopped totally;

7.Low noise

 Harsh noise and rebounding free when car rolls