Gray iron manhole covers ductile iron manhole cover 
 I am using the international standard production cast iron, all the covers excellent material. Designed and manufactured in full accordance with EU standards, and fully in line with China in 2009 will be awarded the national standard. Production of high strength ductile iron manhole covers, can carry all types of vehicles to ensure that no rupture, the safety rate of 100%, and light weight, resistance to corrosion. Quickly through the covers when the vehicle was no noise, no cover and flip jump phenomenon occurs. Security can be made according to customer demand, waterproof, anti-odor-type covers. According to the needs of different regions or departments create a character and cast of characters the pattern, surface friction of a large, non-slip resistance. Export of high-volume production for many years running water, rain water, sewage, electricity, telecommunications, fire with the covers. 
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