(1) Environmental protectionWith raw material non-toxicity, it will not influence to user;(2) Saving mine resourceIt is made by regenerated resin or regenerated plastic raw material, which save application of cast iron.(3) LongevityAcidalkali and corrosion resistance; Anti-rust; insulation; anti-abrasion; weatherability; excellent anti-pressurecapability;(4) Competitive priceThe price of compound manhole cover is lower than stipulated standard cast iron ones;(5) Light weightThe 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;(6) Nice appearanceOutstanding 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;(7) Anti-theftNon-recycle, anti-theft naturally; the lock attachment can prevent tunnel products from losing, therefore city blackhole can be stopped totally;(8) Low noiseHarsh noise and rebounding free when car rolls
