(1). Material: aluminium: ld31(6063);steel: specific mild steepipes for liquid;copper:99 copper(3n) (2). Technologies: 1).Unique 3 inner corrosion prevension layers.2). Inductive automatic welding technology(invisable welding) 3). Adopt patent technology by general research institute for nonferrous matals.4, double pressure test. 4), 100% inspection. (3). Uniques: 1) wide joints of horizontal and vertical make products more efficiency; 2)no need of full water maintenance, more economic during usage. 3) various 2-side designs; removable colorful covers, more beautiful, easire to clean.4ú¬offer various central distance with different assembly