100% Brand New Power: 200W Voltage: 220V-240V Frequency: 50Hz Pressure: > 0.033MPa min Air Flow: 0.135m3\min DIA.OF OUTLET:12mm SPEC. of diyder: 12 Size: 285x165x175mm Features: Non-oil lubricated, no pollution to air and noise. Cylinder and piston made of strong and durable material, little wear after long-term of working. Widely used for oxygenation purpost. Such as fish farm. restaurant and aquaria.