The Enviro ET100 A air pump helps to increase the amount of oxygen in the water. Providing a clean, oil-free air source it is exceptionally quiet in operation, as low as 35dB even when running continuously. With a built-in alarm, the ET100 A detects low pressure in the airline with an integral high sounding buzzer and bright LED warning signals. The ET100 A is easy to service with a competitively priced service kit and is also supported by our two year warranty.