Check the listing for details. Aquarium Air Pump 55gal Fish Tank Bubbler with Air Stone Tubing Check Valve. Condition: New. Listed at 11.99 USD. Features: Ÿ The fish tank air pump keeps your aquarium well aerated making your fish more active and adorable when they playing in the bubbles. Ÿ The oxygen aerator is powerful enough to run air stones in your hydroponic reservoir encouraging your plants growth. Ÿ Rubber stabilizer feet to minimize the noise caused by vibration. Ÿ With a control knob, you can adjust the air flow needed. Ÿ The check valve will protect you air pump by preventing aquarium water from back siphoning during a power outage when you place your air pump below the aquarium water level. Ÿ Great to use in freshwater, saltwater tanks and small hydroponic setups. Specifications: Ÿ Recommended Tank Size: 55 gallon Ÿ Dimension: 4x2.25x1.75 inches (L x W x H) Ÿ Length of power cord: 3.5 ft Ÿ Voltage: 110V-120V/60Hz Includes: 1x Air Pump 1x 4’ Tubing 1x Check Valve 1x 1” Air Stone Directions for Use: 1. Cut the tubing to the length needed. 2. Attach the airline into the pump; connect the air stone to the other end of airline. 3. Place the pump above the aquarium or bucket if possible. Or you need to add a check value (the blue valve) between air pump and air stone to prevent back siphoning. 4. Plug the pump in. Remember to create a "drip loop" for the power cord.