The Viagrow adjustable air pumps are made with state of the art technology to produce reliable high volume air production with little noise (only 35DB) and low power consumption. Viagrow air pumps are great for aquariums, aquaponics, hydroponic systems, aerating pond water and water treatment. Using the Viagrow air pumps to aerate your water or nutrient solution helps to increase oxygen assuring overall health in your water or solution. Features quiet, compact size and lightweight. Suitable for both freshwater and marine aquariums. Can aerate up to 200 gallons of water. Voltage: 110 -120 V 60 Hz, Exhaust: 18 L/M (4.5 L/min per valve) Power: 8W, Dimensions 8.5 in long x 5.5 in wide x 3.5 in high. Air valves accepts 3/16 ID air tubing. Directions for Use: 1. Cut the tubing to needed length. 2. Attach the air line into the pump, connect the air stone to the other end of airline. 3. Place the pump above the aquarium or bucket if possible. If below the water line, you need to add a check value between air pump and air stone to prevent back siphoning. 4. Plug the pump in for operation **Air pump should not be submerged in water for dry use only**