Pawfly Aquarium 1.8L/min Compact Air Pump For 20-75L Tank, With 1 air stone
1 Air Stone Ball: 2 D x 3.4 H(cm). Quiet Aeration: With diaphragms inside and 4 shockproof rubber feet to reduce noise and vibration, the pump gives out noise less than 45 dB like the hum of a refrigerator.