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.
These one-way non-return check valves are simple to install, just 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. Pack of 5.
Compatible with standard 4mm airline tubing.
Suitable for freshwater and saltwater aquariums.
Product Features:
- Prevents backflow and protects your air pump from water damage
- Stops flooding caused by power failures or pump issues
- One-way design allows air through but blocks water
- Simple and affordable solution for extra peace of mind
Product Specifications:
- Product: Non-Return Check Valve
- Colour: Red
- Quantity: 5
Items Included:
- 5 x Check Valve
Check Valve - 5PCS
Check Valve - 5PCS
Low stock: 9 left
Everything about shipping, specifications and warranties is just below.
Why Shop With Us — Our Guarantee & Shipping Info
Why Shop With Us — Our Guarantee & Shipping Info
✅ Quality Products - Reliable aquarium supplies for your setup.
🚚 Standard Shipping ($11.95 - $19.95) - Safe & reliable delivery, arrives within 3-10 business days. Shipping cost: $11.95 small orders, $14.95 medium orders, $16.95 large orders, $19.95 bulk orders.
🛡️ Warranty Support - Most eligible equipment and accessories are backed by a 1-year manufacturer warranty, with claims handled through us.
🔄 Easy Returns - Most unopened dry goods can be returned within 14 days for change of mind, subject to our return conditions.
🤝 Trusted Couriers - Reliable delivery at a great rate.
💬 Expert Support - Got Questions? Chat with us anytime for advice!
🐟 Adding fish to your order? - Fish, Food and Plants ship separately from our dry goods collections with our Live Arrival Guarantee. When ordering from both our dry goods and fish/food/plant collections, both shipping fees will apply (example: $30 fish & food + $11.95 dry goods = $41.95 total).
👉 For more details visit our Shipping page.
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 Maintenance & Care for ongoing tank tips!
🌿 Not all products are suitable for every tank size - Double-check dimensions and specifications before purchasing.
✍️ If you’re stuck: Reach out through our chat, we’re always happy to help!
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How the Aquarium Check Valve Compares
🛡️ Aquarium Check Valve
- ↩️Helps Prevent Backflow: Allows air to travel towards the aquarium while helping prevent water from travelling backwards through the airline.
- 💧Protects Air Equipment: Helps reduce the risk of aquarium water reaching your air pump if water attempts to flow back through the airline.
- 🔌Useful During Power Outages: Provides an important barrier if the air pump stops running and the pressure in the airline changes.
- 🔧Simple Inline Protection: Installs directly into the airline without requiring changes to the air pump or aquarium.
- 📦5 Valves per Pack: Provides enough valves for multiple air lines, tanks or replacement spares.
⚪ Airline Without a Check Valve
- ↩️No Backflow Barrier: There is nothing in the airline specifically designed to stop water travelling backwards towards the air pump.
- 💧Water Can Travel Down the Airline: If the pressure changes or the pump stops, water may move back through the airline towards the equipment.
- ⚠️Greater Risk to the Air Pump: A pump positioned below the aquarium can be particularly vulnerable to water reaching it through the airline.
- 🔧Relies on Other Protection: Preventing backflow depends on installation choices such as keeping the pump above the aquarium water level.
- 🛠️One Less Layer of Protection: The airline remains directly connected between the aquarium and air equipment without a dedicated one-way valve.
We recommend a check valve to every customer running an air pump, and mention it 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.
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 if it shows signs of cracking or deterioration.
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