Silent Air Auto Back-Up Air Pump - #B11
This Battery Powered Air Pump is a powerful and versatile air pump that will aerate your aquarium during a power outage or when there is any interruption to your AC power. Can also be used for transporting fish or for use in temporary tanks. Penn-Plax - Silent Air B11 Series Battery Operated Aquarium Air Pumps, Single Outlet. Reliable and long lasting perfomance during a power outage. The bubbles come ON when the power goes off! Detects any loss of AC power and turns on automatically. Attractive and compact design fits almost anywhere. Requires two "D" size batteries (not included).