★ Quiet Air Pump

The upper and lower shells are tightly sealed, and the thickened side shells wrap the gap, effectively reducing noise.

★ Details:

1. More accuracy adjustment: The whisper aerator has high accuracy electric adjustment, easier to get suitable air volume.

2. 4 metal outlets: There are 4 metal outlets on the fish tank bubbler, high quality, durable and corrosion-resistant.

3. Larger air capacity: High frequency all-copper pneumatic motor, produce more bubbles, provide enough oxygen for fish.

1. Free accessories: Air Hose 1.5M*4; Air Stone*4; Suction Cup*4; T connector*2; Filter Cotton*2; Return Valve*4; Regulating Valve*4

2. Installation of Return Valve: The larger end should close to the pump, and the smaller end should close to the air stone.

3. Replaceable Filter Cotton: Filter cotton can filter the impurities in the air. Extra air cotton is provided for replacement.

Installation:

No return valve is needed: 4-outlet fish tank air pumps should be installed higher than the water level to prevent the water from flowing back into the air pump.

No return valve is needed:

FEDOUR 4-outlet air pumps should be installed higher than the water level to prevent the water from flowing back into the air pump.

Return valve is needed:

lf you install the aquarium air pump lower than the water level, return valves should be needed, otherwise the water in the air hose will flow back into the air pump, causing damage to the air pump.

No return valve is needed:

FEDOUR 4-outlet air pumps should be installed higher than the water level to prevent the water from flowing back into the air pump.