Hygienic, nontoxic, without secondary pollution: no filthy, alga nor other microorganisms will be caused in the process of using; can avoid the secondary pollution caused by rust water filth of the zincification pipe. Strong in anti-corrosion: resisting most of the strong acids and alkalis, free from the affect of corrosive soil and soda acid liquid.Wide water flow: smooth both in inner and outer wall, without accumulated filth and little friction coefficient.Convenient for installation: the material density is only 20% of the steel products, easy in handling.Long life for use: with advanced process, the product is highly compression resisting, offering high tensile strength and good in maintaining quality. Scope of application:The products can be applied in civil construction water supply project, municipal engineering, chemical engineering,agricultural irrigation project, landscaping engineering, water plant water supply project and marine aquaculture industries.