Hakko Air Pumps are high volume diaphragm pumps designed for a variety of low-pressure applications. Koi pond aeration, large aquarium aeration and earth pond destratification are only a few of the many applications for Hakko pumps. Hakko pumps are compact, affordable, energy-efficient and very, very quiet (less than 38 decibels!)! Hakko units utilize linear- motor theorem to reduce power consumption during full operation. Units are extremely quite utilizing spectrum analysis technology in order to decrease any mechanical noise.
No oil needed for lubrication making the Hakko easy to maintain.
These are the best large air pumps available today.