Dongying Panlong is a high-tech enterprise which integrates technological research, design, production and sale composite manhole cover, trench cover, drain grate, tree grate etc. It is located in Chinese second largest oilfield - Shengli Oilfield, center of the Yellow River Delta City - Dongying City, Shandong Province.

As a major manufacturer of polymer covers, we adopt the mould pressing craft of the composite material to serve a huge variety of markets. Our products which with the advantages of lighter in weight, high intensity, good anti-theft, high durability, corrosion-resistance, long life as well as perfect shape, have powerful life-force. Including polymer manhole cover series, polymer trench cover series, drain grate series, tree grate series, grass cover series etc. With a wide range, good quality, reasonable prices and stylish designs, our products are extensively used in heavy road, walking Road and other industries.