AP-40 Air Pumps have an Energy Efficient Motor, Very Quite High Volume Steady Air Flow with 2900 cu. in/min (47 L/min) 4.85 psi Air Volume. Uses 40 Watts to operate. Single Outlet Discharge. 12 Outlet Air Manifold Included. For Indoor or Outdoor Operation. It is Recommended to Protect Air Pump From Direct Element Exposure.