23 ' ( COMMERICAL GRADE ) POND AERATION WINDMILL AERATOR WIND MILL BELLOW COMPRESSOR DESIGN THAT PRODUCES 3 & 1/2 TIMES MORE VOLUME OF AIR vs MOST DIAPHRAGM COMPRESSOR BELLOW HAS A 15-20 YEAR LIFE EXPECTANCY POWDER COATED STEEL WHEEL HUB - 4 LEG TOWER MADE OF 14 GAUGE GALVANTIZED METAL 2 SELF LUBRICATING UHMW BLOCKS ON A POWDER COATED STEEL TOWER TOP STARTER 3-6 CFM OUTPUT - RATED FOR PONDS/LAKES UP TO 2 ACRES IN SIZE