Two kinds of pipes: GRP filament winding pipes and GRP sand pipes. Specifications of GRP filament winding pipes: 1. Diameter: 25mm~4,000mm. 2. Length: 6m/12m per pipe. 3. Pressure: Middle and low, 0.6MPa~2.5MPa. High pressure: 5.5MPa~24MPa. 4. The pipes meet the standard JC552, as for export, the standard ASTMD2996 is adopted. Specifications of GRP sand pipes: 1. Diameter: 300mm~4,000mm. 2. Length: 6m/12m per pipe. 3. Pressure class: 0.1MPa, o.6MPa , 1.0MPa , 1.6MPa 4. Stiffness: 2,500 Pa, 5,000Pa, 10,000Pa. 5. The pipes meet the standard JC/T838, CJ/T3079, as for export, the standard AWWAC950 is adopted.