Description:
A check valve is a small but critically important piece of equipment for any aquarium running an air pump. Without one, if your air pump loses power, water can siphon back through the airline tubing and into the pump, causing water damage or flooding. A check valve prevents this by allowing air to flow in one direction only, from the pump to the tank, while blocking any reverse flow of water.
This is particularly important if your air pump sits below the waterline of your tank, where the risk of backflow is highest. Even if your pump sits above the waterline, a check valve is inexpensive insurance against the unexpected, and something we recommend to every customer running an air pump.
These one-way non-return check valves from Pet Worx, an Australian company established in 1980, are simple to install. Cut your airline tubing and insert the valve in line between your air pump and your air stone or sponge filter, making sure the arrow on the valve points toward the tank. Compatible with standard 4mm airline tubing. Pack of 12, giving you enough for multiple tanks or setups across a fish room.
If you're running a Pet Worx Single or Twin Air Pump, or any other air pump pairing it with a check valve is strongly recommended.
Suitable for freshwater and marine aquariums.
Pet Worx - Check Valve - 12 Pack
Pet Worx - Check Valve - 12 Pack
Low stock: 6 left
Why Shop With Us — Our Guarantee & Shipping Info
Why Shop With Us — Our Guarantee & Shipping Info
✅ Quality Products - Reliable aquarium supplies for your setup.
🚚 $11.95 Flat-rate shipping - safe & reliable delivery, arrives within 2-8 business days.
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Tips Before You Buy — Product Guidance
Tips Before You Buy — Product Guidance
💡 Unsure which product is right for your tank? Visit our Education section or Blogs for help choosing the best equipment.
🐟 Beginners can start with: How to set up your aquarium, while everyone can check out Aquarium Maintenece & Care for ongoing tank tips!
🌿 Not all products are suitable for every tank size — Double-check dimensions and specifications before purchasing.
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We mention check valves in the descriptions of our air pumps and air stones for good reason. It's one of the cheapest accessories in the store and one of the most important. A flooded power board or a damaged air pump from a single power outage costs far more than a pack of check valves. The 12-pack makes it practical for fish room keepers and breeders running multiple air-driven setups.
Check valves are low maintenance but should be inspected periodically. If you notice reduced airflow from your air pump, a blocked or stuck check valve is a common cause. Replace if the valve no longer allows free airflow in the correct direction or shows signs of cracking or deterioration. With a 12-pack on hand, replacements are always ready when needed.
