Single Outlet / High quality more bubbles more air flow.High polymer composite rubber air pump for long working life and reliability.Low noise, generous air capacity, dose not require oil lubrication.Electronic control of input ratio for high efficiency and low energy consumption. Reliable function and low price.The standard in high-quality air pumps, provides high performance and reliability.Generous air capacity, efficient with low power consumption. It provides ample power to supply your accessories To aerate all types of aquarium tanks To install two pieces of single battery which are additionally purchase, To insert the enclosed ethylene plastic tube(with air ring) at the air outlet,To insert the end with air ring into the water then connect to the power supply.