This is Tianjin Zhengyu International Trade Co., specialized in producing manhole covers for more than 20 years in China. The Foundry factory with capacity around 35,000 tons of castings per year and maintained good cooperation with some famous companies like Siemens and Altendorf etc.. The main products we supply, which can be all customized:1.Round manhole covers2.Square manhole covers3.Gully and channel gratings & Tree grates4.Steel gratingShould any interst in above products, please contact me at Lisa_liu02 AT 163.comBest regards,Lisa
