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The CO2Art Precision CO2 Check Valve is an essential safety accessory designed for CO₂ injection systems in planted aquariums. This inline non-return valve ensures gas flows only in the correct direction and prevents water backflow into your regulator, solenoid, or diffuser.
Built to withstand high pressure (over 100 psi) and featuring an ultra-low cracking pressure of just 1 psi, it’s ideal for both beginner and advanced CO₂ setups. It comes with push-in connectors for 4/6 mm CO₂ tubing and is compatible with CO2Art tubing systems.
Key Features:
High-pressure resistance: >100 psi for safe operation in CO₂ systems.
Low opening (“cracking”) pressure at ~1 psi — ensures gas flow starts easily but blocks backflow of water.
Flow direction arrow – install inline correctly to ensure proper protection.
Push-in tube connections compatible with standard 4/6 mm aquarium CO₂ tubing.
Compact, robust construction – suitable for continuous use in planted aquariums.
Usage Tips:
Install the check valve as close as possible to the aquarium or diffuser to minimise back-siphon risk.
Ensure the arrow on the valve points in the direction of gas flow from cylinder → diffuser.
Always use with CO₂ tubing that is rated for high pressure and compatible with the valve.
Regularly inspect the valve for signs of wear or blockage, especially if you notice erratic bubble flow.
