Pond Logic PondAir2 aeration kit is compact and can be used outdoors during the hot summer months as well as during the cold harsh winter months. Vented rock cover is recommended when used outdoors for protection. It is good for ponds up to 1,000 gallons. Airline: (2) 0.25" W x 300" D. Specifications: High efficiency dual output compressor that uses only 4 watts with a max air flow of 0.15 CFM.