Dymax Air Pump AP300 is designed with advanced air-compressing system and multi-level muffler which produces extremely low noise. Special synthetic diaphram is used to regulate steady air compression without the loss of efficiency. AP Air Pump series comes with 4 dampers at the bottom of the housing so as to reduce noise and vibration during operation. Dymax AP Air Pump series is ideal for : action ornaments; bubbling air stones for oxygenation; sponge filters; corner filters; under gravel filters; creating current to prevent stagnant water; as well as protein skimmer for marine. AP300 – 1 outlet. No pressure control. 2.5watt 3L/minute