underground,with resin mortar,GRP pipe Character: light, high strength,corrosion and water resistance,excellent hydraulic property and so on.Specification: Diameter: DN300-4000 Pressure:PN0-25 Stiffness: SN2500-10000 Standard length: 6m, 11.6m Execute standard: AWWAC950,BS,ASTM and ISO. FRP pipe