1. Combine the mechanical strength of steel pipes and the corrosion resistance of plastics;
2. The outer wall coating is more than 2.5mm, resistant to scratches and bumps;
3. The friction coefficient of the inner wall is small, 0.0081-0.091, which reduces energy consumption;
4. The inner wall meets national health standards;
5. The inner wall is smooth and not easy to scale and has a self-cleaning function.