1、3 in 1 filter, included filter, increase oxygen, pump water. 2、The shell adopts ABS material, , good insulation performance and no water leakage. 3、The shaft core and shaft sleeve are made of ceramic or stainless steel, which is resistant to acid and alkali and corrosion. 4、Built-in biochemical filter cotton, effectively promote the reproduction of nitrifying bacteria, high density, good water permeability, can be used repeatedly. 5、Suitable for all kinds of aquarium, ecological tank water circulation, biochemical filtration purification water , and support oxygen function. 6、Duck beak water flow adjustment head, adjustable flow, adjustable direction. 7、Top filling glue to seal, security is strong. 8、The bottom of the base is evenly distributed, concentrating the capacity to avoid inhalation of small fish, and the suction is better. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia