ECONOAIR-400 [3/4hp] Non Cabinet Pond and Lake Aerator [For 3 to 7 Surface Acres]Special Notice: As of Sept 1, 2022 we will be using the RELIANCE 9. 5 SRC 3 4hp air compressor for this product. The ECONOAIR 400 3 4hp pond and lake aerator includes these important FEATURES: *IMPORTANT NOTICE: All ECONOAIR sub surface aeration systems must house the air compressor inside a building barn or other structure to keep it out of the rain and or snow. Ventilation is also critical to keep the air compressor cool during operation. RELIANCE