Danner Manufacturing, Inc. Oxy-Flo, High Volume Air Pump, AP-40, #40524 Pondmaster Supreme Hydroponic Air Pump AP-40 Energy-Efficient Motor Easy to Use Quiet Operation Aerate nutrients to stimulate root growth with supreme hydroponic 40-watt air pump It's capable of 2900-cubic inch per minute air volume with steady air flow This quiet, easy to use pump features an energy-efficient motor and single outlet discharge No lubrication is necessary; air diffuser is included 1 Year limited manufacturer warranty