... surfaces. With its unique wall structure design, such pipe has advantages of strong ring stiffness, light weight, ... used in municipal transforming projects.constructions,agricultural and industrial drainage, agricultural water-saving irrigation, wastewater processing industry, ... Specifications are as below (nominal inner diameter):200mm, 225mm, 300mm, 400mm, 500mm, 600mm, 700mm ,800mm and 1000mm. ...