About this item Adjustable Air Pump:The Jerepet 8W aquarium air pump comes with a flow control knob, preciselly controll the air flow according your preferences, max flow is 320 gallon per hour ; 4 outlet air pump:each outlets supply 5000ml air flow per minutes, can be used the aquarium size up to 300 gallons; Aquarium Air Pump With Accessoiris:this oxyhen pump comes with 4 air stone,4 soft tube(1.5M length for each),4 check valve; Low Noise air pump: the noise level lower than 40 dB; Wide Application: can be use as aquarium air pump ,small pond air pump ,hydroponic air pump ,restaurants fish tank air pump ; Specs:Max Air Flow:320GPH or 4x5L/Min;Water Depth: