🐟6-step Quiet Air Pump: Thickened ABS plastic, sealing machine noise; Stainless steel cover, locked motor sound; Bearing less motor, works through magnetic bearings; Internal support feet, the motor does not touch the cover, reduce noise; 8 bottom rubber feet, reduce vibration; Noise reduction motor..🐟Adjustable Air Pump: With adjustment control knob, the air flow can be adjusted according to your own preferences, up to 255GPH. The air is used to vibrate the air bubbles to increase the area of the water contact with the air, so that the water can dissolve the oxygen, thereby increasing the oxygen content in the water..🐟Double Air Outlet Pump: The bubbles are even,natural and stable. Can be connected to nano air stone, biochemical sponge filter, landscaping windmill rockery, and other aquarium aerobic landscaping equipment. Suitable for 20 to 600 gallon fish tanks (cannot exceed 6 feet water depth)..🐟Stable and Durable: Full copper wire motor, more power saving, longer life and more stable operation. And the diaphragm made of special synthetic rubber is durable. The bottom air intake filter blocks the impurity particles, makes the air more pure, and make the air pump run normally..🐟High-quality Guarantee: With ABS environmentally-friendly plastic case, which is high-density thickening, anti-drop, wear-resistant, high temperature and low temperature are not easy to deform. To get a warranty, please contact the seller to resolve your issue, thank you.