... construction and durable, instead of multi-holes concrete pipes, PVC pipes and HDPE double side corrugated pipes step by step, become the perfect products ... , anticorrosion of chemicals. With long service life, and will not deteriorate within 50 years in the earth.6. Good weather ... 42, 32/26. We can refer the following table for select appropriate pipes: OD of Cable (mm)≤111212.513.5141516ID of ...