Pond Logic® PondAir™ Aeration Systems are ideal for decorative ponds and water gardens up to 2,000 gallons. Powered by highly efficient diaphragm compressors, Pond Logic® PondAir™ Aeration Systems infuse your pond with valuable oxygen while remaining whisper-quiet and cost effective. An airflow control valve on the top of the Pond Logic® PondAir™ Aeration System lets you adjust the aeration output to your pond with the simple turn of a dial. Every Pond Logic® PondAir™ Aeration System includes 2" round air stones and flexible black vinyl air tubing.