Advantages:

• High corrosion and aging resistance, so over 50 years of long lifetime;
• High impact strength and mechanical strength
• No jam-up and sediment, smooth internal wall , so small friction and little damage to the water power;
• No smell and poison, no rust, so without re-pollution to the water and pureness;
• Convenient and reliable installation, low construction expenses;
• Good sealing performance;.
• Drain quickly and prevent filter.