VicTsing Ultra Silent High Out Energy Efficient Aquarium Air Pump Fish Tank Oxygen AirPump With 2 Air Stone / 2M Silicone Tube Refuse Water Stagnation. This aquarium air pump is designed to add water movement and oxygen in the fish tank to increase the health of water and give your fish a comfortable environment, improving the overall health of the aquarium Two Air Outlets. Unlike other air pumps which only have one pump head, this new fish tank oxygen air pump features two vents, so it supports provide oxygen to two fish tanks simultaneously. You also can put them together in one fish tank to produce more bubbles according to your needs Low Noise & Note. This aquarium air pump has a multi-level muffler to reduce noise, less than 35dB.NoteIt apply to the aquarium that water Depth not exceed 60cm(23.6 inch) and maximum water capacity about 45 US gallons. Necessary Accessories. This high efficient aquarium air pump comes with 2 air stones, 2 silicone tubes (one is 3.28ft, the other is 3.77ft), which is long enough to provide plenty of choices to where you want them to be placed in Wide Compatibility. This oxygen pump allows for max flow up to 3.5l/min, great for small and medium-sized fish tanks no matter what kinds of aquarium creatures they have, including freshwater and marine. Every aquarium air pump from VicTsing will enjoy 45 days money-back and 12-month worry-free warranty