Fluval Q0.5 Aquarium Air Pump.
Powerful yet extremely quiet, the Fluval Q0.5 Air Pump produces consistent air flow thanks to an advanced swing-arm and diaphragm design. A thick double-wall outer casing, integrated pump well and noise-suppressing baffle chamber make Fluval one of the quietest air pumps to date.
The Q1 is quality constructed and will provide lasting and reliable performance for aquariums up to 190 L (10 - 50 U.S. gal).