666 manufacturers supply drain】 【133.7562.1123 building drain is for the market gardening products specially developed new drainage. A number of green building projects has been widely used by the National Quality Supervision and Inspection Department inspected. This product has excellent water drainage features and functions, is essential for greening projects in the basic materials. Jinan drain construction; Jinan drain price, Jinan, Jinan Drainage Board Drainage Board factory construction; Jinan drain price, Jinan Drainage Board Drainage Board manufacturers, is made of polyethylene plastic injection. Is a set of drainage, water feature in one of the new drainage materials. It also has a water storage, drainage, ventilation, insulation, resistance thorn (plant roots to prevent damage to concrete structures) and other functions. Used in conjunction with geotextile to avoid fine particles and the water reservoir matrix block drainage channels, to maintain unobstructed drainage and air circulation, to form a complete, new storage, drainage system, are widely used