The Fluval Q5 air pump is powerful yet extremely quiet, producing a steady airflow thanks to its advanced swing arm and diaphragm design. A thick double-walled outer casing, an integrated pump chamber, and a noise-dampening baffle make the Q5 one of the quietest air pumps to date. The Q5 is built to high standards to provide lasting and reliable performance for aquariums up to 190 liters (50 US gallons).