Matala Hakko MEA Pro 4 PLUS EZ-air Pond Aeration Complete System For ponds from 8000 to 20,000 gallons Includes 1 Hakko HK60L Linear Pump, 50' of 3/8th airline, and 2 MDB11 diffusers w/ bases maximum air flow of 82 liters per minute or 2.9 cubic feet per minute 61 watts