Description: Air Bubble Disk Stone Aerator Aquarium Fish Tank Pond Pump Hydroponic Oxygen Air Pump Air Hose Pipe- Multi-level muffler, low noise- Oil-free compressed air pure- High-performance, large volume, this section is ideal for small & medium-sized fish tank plus oxygen- Low-power, economic power-saving, Continuous operation & long service life- With regulating valves, can effectively regulate the air displacement- Single/ Double-headed pump, there are two vents, can provide oxygen to two fish tanks at the same time How To Use It :1. The voltage & the frequency of the air feed pump using must be meet requirements 2. The position of placing the air pump must be higher than that of the aquarium, which can avoid the water flowing into the inside place of the machine following the exhaust pipe 3. Connect the gas piping to the air outlet of the air pump, the uniformly distribute the vesicle stone in the aquarium, switch on power supply & the air pump will be air-entrapping & oxygenation 4. You can choose single air outlet or double air outlet depend on the oxygen demand to reach the ideal air supply & oxygenation 5. The filtration cotton of the air pump & the vesicle stone must be washed & replaced in every three months 6. The air pump should disconnect with the power supply, & placed in the dry environment when do not used Specification: Item Type RS-390 Double-headed / RS-290 Single-headed / Air Stone + 2m Air Hose Pipe Material Plastic Color Black Power Rating RS-390 Double