Advantages of COD pipe
Advantages of COD pipe: 1. Each inner pipe of COD pipe stands tightly on the inner wall of the outer pipe during the production process. 2. The inner tube of the COD pipe is smooth and the construction is convenient. 3. The inner tube of the COD pipe is subjected to rigorous compression test in advance, and then used to produce a complete COD tube, together with the special spiral shape of the out