Description

Non Return Valves

A Check Valve or Non Return Valves is an essential accessory for all air and CO2 equipment. It  allows air and liquid to flow only in one direction and automatically closes if the flow is to be reversed. Sold in a pack of 2.

Air and Co2 equipment that is sited at a lower level than the surface of the water in your aquarium runs a strong risk of accidents if a check valve is not installed. The air is blown from the pump into the tank via the air line. However, if the power to the pump were to be disrupted for any reason (power cut, accidentally being switched off etc) or the pump were to cease functioning, the flow will be automatically reversed and water will begin to back syphon from the aquarium through the air line. If left unattended for long enough, the entire aquarium could potentially be emptied onto the floor as the water will continue to syphon until the level reaches below the air stone. A simple and inexpensive check valve prevents this from happening as it will only allow flow into one direction and never the other.

Frequently Asked Questions

Do I need a non return valve?

If your air pump or CO2 equipment sits below the water level of the aquarium, then yes. A non return valve is one of the cheapest and most important safety devices you can install. Without one, water can potentially siphon back through the airline during a power cut or equipment failure.

Where should I position the check valve?

The valve should be fitted inline with the airline between the aquarium and the air pump. Most valves feature an arrow indicating the direction of airflow. The arrow should point towards the aquarium and away from the air pump.

Can I use this with my CO2 system?

Yes. Non return valves can be used for either air or CO2 to prevent water being syphoned into the equipment.

If you have any questions about this non-return or check valve and whether it’s suitable for your aquarium, please contact us and a member of our friendly store team will be more than happy to answer all of your questions.

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