Matala Hakko 120L Air Pump the hakko hk-120 linear air pump represents a top of the line linear air compressor with 3-year warranty.  the hakko air pump 120 will deliver a maximum of 138 liters per minute.  only 126 watts !! suitable for ponds up to 12, 000 gallons.  this is a cast iron body style. It is a small unit with asurprisingly high output. Ideal for water depths between 4 to 12 feet deep. Shut off depth is approximately 18 feet deep. The hakko air pumps are built to last with a ve