High quality outdoor weatherproof casting allowing for the unit to be installed outside with rain causing no issues due to casing seals and design,The aluminium alloy case houses the pump which has a double damping noise absorbing function to reduce noise levels.Diaphragm air pump with twin air chambers provide strong and constant aeration.Non oil lubricated design to provide pure compressed air.Wear and tear resistant material body, Electrical magnetic air compressor, Low noise double damping noise absorbing system.