Features: 1, pressure, shock. ∧ steel tubing with an internal pipe ring stiffness improved significantly enhanced. 2, good economy. With the specifications of large-diameter pipe, tubing, light weight than other materials, fast and easy handling, transportation, installation and connection, and lower total cost. 3, acid, anti-aging, does not corrode sewage, chemicals, UV black pipe, and prolong life. 4, drainage, sewerage unobstructed flow resistance pipe wall, through the water and strong, large flow. 5, secure and reliable connection, can be electric melting, shrinking band, inner and outer extrusion welding is used in combination securely connected, pipe without leakage. Use: 1, municipal engineering drainage, sewerage works. 2, a variety of industrial and agricultural water supply and irrigation projects. 3, road public works, such as railways, highways, golf course and so on. Large concessions, welcome customers to inquire the price