About this item The small air pump for aquariums up to 20 Gallons; Dimension: 4.25×2.5×1.75 inches Adjustable Airflow: With a control knob, you can adjust the air pressure to produce enough bubbles keeping the water oxygenated Quiet Operation: 4 rubber feet help it to stay in place and remains quiet Great to power a small sponge filter, air bubbler decoration, air disc or other air-driven ornaments Complete Fish Tank Air Pump Kit: 1x Air Pump, 1x 4ft Tubing, 1x 1” Air Stone, 1x Check Valve