The Thomas WOB-L piston pump is 1/3 HP, can be operated on high or low voltage and produces 3.95cfm @ 20 psi and can be used in deep water up to 50 ft. or very long tubing runs.
FOB Ohio warehouse
$359.00
(add $20.00 for 230 volt)
(compressor only less manifold)

See The ForeverGreen Economy Aeration System2 for complete package