Aquarium air pump with single-outlet is suitable for one tank or a single air stone, while a double-outlet pump is ideal for two tanks, multiple air stones, or to power two different devices like a filter and an air stone. Choose a single-outlet if you only need to aerate a small tank, but opt for a double-outlet for more power, multiple uses, or to make setups easier.

Weipro CP-901 is an extra compact high-performance single outlet air pump that maintains adequate oxygen and water movement when no immediate power supply is available. The battery-operated air pump is the perfect solution for transporting fish or as a backup power supply during a power failure.

Sonpar Air Pump is a high-performance single outlet air pump that maintains adequate oxygen and water movement when no immediate power supply is available. The battery-operated air pump is the perfect solution for transporting fish or as a backup power supply during a power failure.

Weipro CP-903 AC/DC rechargeable complex air pump for middle to big aquarium installations. This pump special feature is a built-in lead-acid rechargeable battery allows the pump continue running for 24 hours after the AC power is cut. The battery compartment also fits for x4 C-type dry batteries, allows to run more 12 hours.

Aquarium air pump with single-outlet is suitable for one tank or a single air stone, while a double-outlet pump is ideal for two tanks, multiple air stones, or to power two different devices like a filter and an air stone. Choose a single-outlet if you only need to aerate a small tank, but opt for a double-outlet for more power, multiple uses, or to make setups easier.