Aquascape Pond Aerators oxygenate your pond which creates a more stable environment resulting in healthier fish and plants. Aerators can also be used in the winter to keep the pond from completely freezing over. The Pond Air 4 Aerator has a 3 year warranty, is extremely energy-efficient and quiet and includes 4 weighted air stones and 100 ft. of airline. 8"W x 8"L x 4.5"H