Oil-less rocking piston compressors are a great choice for continuous operation applications like aeration because they have high pressure capability but operate at lower rpm's so they run cooler (which means they last longer!), use less electricity and run quieter than similar compressors. Oil-less continuous operation. One year warranty. All welded aluminum parts treated for corrosion protection from moisture. Price includes inlet air filter, rubber foot mounts and 6' power cord. One of the longest lasting, most durable compressors we offer! These compressors combine the higher volumes of air of a rotary vane compressor with the higher pressures of a piston pump. The rocking piston design allows the overall size of the unit to be much smaller and yet deliver high performance and long life. Ideal for aeration in ponds too deep for the Rotary Vane models. Oil-less, quiet, dependable operation. 1/3 HP motors available in 115v. One of the longest lasting air compressors we offer. Aerates up to 40' deep