3W 220V Double Oxygenation Holes Aquarium Air Pumps, Ultra Quiet, 4L Flow Per Minutes, Adjustable Air Flow for Aquarium 60L-100L

Flow rate 4L per minute, adjustable air flow, for aquarium 60-100L. This air pump adopts the latest technology to make it ultra-quiet in operation, Minimum 25dB, just like rusty leaves or time watch, very quiet. Traditional and reliable mechanical adjustment of air volume, much less shaking and no fluctuation of electric field, much safer than electronic adjustment, much more reliability. The air filter cotton is easily replaceable, maintaining the clean oxygen supply to your aquarium, while ensuring a more stable gas outlet. The air volume is adjustable inside, this function allows your fish to have a comfortable environment, because different fish, different tanks, even different seasons, require different air volume