Brand new Recirculating Quad Air Pump Kit 13.6 L/Min, 4 Outlet, 4-Valve SB988 adjustable air pumps are made with state of the art technology to produce reliable high volume air production with little noise (only 35-40DB) and low power consumption. ? The product possess advanced air compressing system,damping sustem and multilevel muffler which is extremely low in noise. This air pump is great for aquariums, aquaponics, hydroponic systems, aerating pond water and water treatment. Using the this 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: 16 L/M (4L/min per valve) Power: 12W, Dimensions 8.5 in long x 5.5 in wide x 3.5 in high. Air valves accepts 3/16 (5mm) ID air tubing. Kit includes: 2x 15 ft. 3/16 in. Clear tubing/ 4 round 2 in. Air stones/ 4 - 4 mm Check valves the four valve air pump. 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 Adjustable air control output 4 air outlet (5mm) ? Engergy saving design ? Long lasting performance