There are three models with a pump outlet from 100 (one outlet), 200 (2 x 100) and 400 (2 x 200) l/h, on which the smallest model has one and the two larger ones both have two individually adjustable air outlets. And they come equipped with one or two EHEIM diffusors.
The air flow can be regulated at each outlet on the pump and also on each diffusor. This allows you to set your own individual bubble effect.

By the way: Vibration dampening rubber edgings contribute to the pump's quiet operation. The air pump stays still and doesn't wander about.   Or you can hang it vertically on the aquarium glass. Specially for this there is a hook.

Advantages of the EHEIM air pump
* 3 models to fit all common aquarium sizes
* Very quiet operation
* Long service life, best quality
* Airflow adjustable at each air outlet on the device
* Additional adjustment of the air flow and bubble effect using the diffusor
* Completely equipped with:
- Diffusor: air pump 100 = 1x; air pump 200, 400 je 2x
- Airline: air pump 100 = 1 m; air pump 200, 400 je 2 m
* (Diffusor also available as a separate accessory)
* Rubber suction pads to dampen vibration
* Hook for hanging vertically

*Note that this product is going through a packaging change and you may receive new or old packaging*

Marina Air Pumps are efficiently designed to increase water movement in aquariums for proper oxygenation, which helps to create a healthier environment for fish and live plants. They combine powerful and consistent airflow with silent operation for effective results.

• Ideal for aquariums up to 40 US Gal / 150 L
• Efficient: For increased oxygenation creating a healthy environment
• Powerful Airflow: Efficient design for optimal flow
• Silent: Sound dampening shell and vibration suppressing rubber feet
• Durable and Reliable: Consistent high-performance output
• For use in freshwater and saltwater aquariums
• Required: Airline tubing
• Recommended: Check Valve

Single Outlet Output: 85 L per Hour

*Note that this product is going through a packaging change and you may receive new or old packaging*

Marina Air Pumps are efficiently designed to increase water movement in aquariums for proper oxygenation, which helps to create a healthier environment for fish and live plants. They combine powerful and consistent airflow with silent operation for effective results. 

• Ideal for aquariums up to 60 US Gal / 225 L
• Efficient: For increased oxygenation creating a healthy environment
• Powerful Airflow: Efficient design for optimal flow
• Silent: Sound dampening shell and vibration suppressing rubber feet
• Durable and Reliable: Consistent high-performance output
• For use in freshwater and saltwater aquariums
• Required: Airline tubing
• Recommended: Check Valve

Single Outlet Output : 2 x 110 L per Hour

*Note that this product is going through a packaging change and you may receive new or old packaging*

Marina Air Pumps are efficiently designed to increase water movement in aquariums for proper oxygenation, which helps create a healthier environment for fish and live plants. They combine powerful and consistent airflow with silent operation for effective results. 

• Ideal for aquariums up to 15 US Gal / 60 L
• Efficient: For increased oxygenation creating a healthy environment
• Powerful Airflow: Efficient design for optimal flow
• Silent: Sound dampening shell and vibration suppressing rubber feet
• Durable and Reliable: Consistent high-performance output
• For use in freshwater and saltwater aquariums
• Required: Airline tubing
• Recommended: Check Valve

Single Outlet Output : 50 L per Hour 

Marina Air Pumps are efficiently designed to increase water movement in aquariums for proper oxygenation, which helps to create a healthier environment for fish and live plants. They combine powerful and consistent airflow with silent operation for effective results. Five model sizes are available to accommodate most popular aquarium sizes.

• Ideal for aquariums up to 25 US Gal / 100 L
• Efficient: For increased oxygenation creating a healthy environment
• Powerful Airflow: Efficient design for optimal flow
• Silent: Sound dampening shell and vibration suppressing rubber feet
• Durable and Reliable: Consistent high-performance output
• For use in freshwater and saltwater aquariums
• Required: Airline tubing 
• Recommended: Check Valve

Single Outlet Output: 60 L per Hour

Cascade presents the Nano Air Pump by Penn-Plax. This air pump quietly aerates and oxygenates fish tanks at a rate of 1.2 Liters per Minute (1.2L/Min), and is the perfect size for small desktop aquariums or Betta bowls. It connects to an electrical wall outlet via a 26.5” long power cable, and is safe for both freshwater and saltwater fish tanks. 

Features:

• Operating at a silent 43dB, the Cascade Nano Air Pump will never disturb your sleep, and leave you wondering where all that humming is coming from.
• In addition to holding things in place, the vibration absorbing base ensures no unnecessary noise is heard.
•  Please Note: airline tubing and accessories sold separately. 
• Please Read Directions: For optimal performance and longevity, please read and follow included directions.
• Always have a drip loop or safety check valve, and never place into water. 

Measurements: Overall = 2” (W) x 3.25” (D) x 1.5” (H) / Electrical Power Cord = 26.5” (L).