Simple Backflow Protection for Your Aquarium
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Keep your air pump and CO2 line safe with easy, reliable flow control.
These plastic one-way check valves help protect your aquarium gear by stopping water from traveling backward when power drops or pressure changes. They are lightweight, durable, and keep air moving smoothly. A friendly little helper for your fish tank, aquaponics setup, or any air-driven system.
A small part that makes a big difference.
✔ Helps keep pumps safe
✔ Easy to add to air lines
✔ Smooth, low-resistance airflow
✔ Durable plastic body
✔ Great for aquariums and aquaponics
Simply check the arrow direction before installing to match your airflow. Wipe clean as needed to keep it clear and working well.
We are proud to offer duty-free, reliable, tracked shipping— delivered to your door in over 200 countries worldwide!
Below you can check our average shipping times:
Domestic USA Shipping: 2-9 business days
US & Canada: 7-18 days
Europe: 7-18 days
Europe Plus*: 8-30 days
Australia, New Zealand: 7-18 days
Hong Kong, Singapore: 7-18 days
Rest of the world: 8-30 days
*does not include processing times up to 2 business days or longer in peak periods
Primarily we ship out from fulfillment centers in the United States, Eastern Asia and Western Europe. If the item you've purchased is out of inventory in your nearest location, we'll send it directly from our production lines at the same delivery times as stated in our shipping section.
Does this check valve work with most aquarium air pumps?
Yes, it fits standard air tubing and works well with most common aquarium air pumps.
Can I use it with a CO2 setup?
Yes, it helps prevent water from flowing back into your CO2 line.
Is installation difficult?
Installation is simple. Just place it inline with the arrow pointing toward the tank.
Stops water from flowing back into air pumps or CO2 systems.
Supports smooth airflow for calmer, more stable tank conditions.
Just connect it inline and you’re good to go.
Plastic construction offers worry-free, long-lasting use.
Useful for aquariums, aquaponics, and small fish farms.
Enjoy simple, dependable backflow protection.
| Features | MK Aquarium | Knock-Offs |
|---|---|---|
| Basic backflow prevention | ||
| Low-resistance airflow | ||
| Clear body for easy viewing | ||
| Lightweight plastic build | ||
| Easy inline setup | ||
| Good for aquariums and aquaponics | ||
| Helps protect CO2 systems | ||
| Durable corrosion-resistant design | ||
| Pack of 10 for extra value |
It offers low resistance, so most pumps will keep a steady, gentle flow.
Yes, the plastic design works well in many indoor and outdoor setups.
Just match your airflow with the arrow on the valve body.
Yes, it simply controls airflow and does not release anything into the water.
Many hobbyists use them for long periods, but replace if airflow slows or debris builds up.
Yes, it fits standard tubing used in small and large tanks.
No, it stays quiet since it only guides airflow.
You can wipe the outside and replace if the inside becomes clogged.
Yes, you get 10 valves in each pack.
