Hailea 9820 Air Pump Ultra QuietAir Pump High Output 10 output gives 5. 8L min to each stone Hailea 9820 3500 L hr, 58L min Fixed high output air pump that is made for quiet running and features long life Supaflex Valves Ideal for aerating nutrient solutions 10 output gives 5. 8L min to each stone Comes with a 10 output manifold and short flexi pipe 13mm into 8mm to connect Notes: 13mm output, of pump. Can use our 13mm pipe 4mm outputs from manifold. Use our 4mm airline Manifold