Tetra Whisper 300 Dual Outlet Aquarium Air Pump Patented dome shape alters sound waves as just one of the many features the Whisper uses to assist with reducing noise. Making the Tetra Whisper an ideal aquarium air pump.Tetra Whisper 300 Specifications: Uses just 4.5 watts of power Twin outlet 300 lph Designed for tanks up to 300 litres 2 Year WarrantyTetra Whisper: Is a quiet air pump that utilises a number of technologies to help with reducing the sound. These include:- Patented dome shape and sound damping chambers. Wide footprint to help disperse sound. Rubber Feet. Suspended Pump motor. Thick walls to reduce noise emission. Insulated Motor.Tetra Whisper includes a air control valve, just add standard aquarium air line tubing, a non return check valve and connect it to a airstone, air curtain, sponge filter or decorative ornament and your all up and running.