These long lasting, continuous duty compressors offer less depth capabilities than the diaphragm or rocking piston compressors but produce considerably more air. These medium pressure, oil free compressors are excellent for pond and lake aeration and de-icing. The carbon vanes self adjust to maintain maximum efficiency and are easily replaced when worn out. All models have an 18' maximum operating depth. All units come with air filter, 7' power cord and a one year warranty. Air outlet assemblies are available with two, three, four or five valves, allowing one pump to supply up to five air manifolds. 115 volts. If you want this unit in a 230 volt, please indicate so in the shopping cart notes.