Inline Aquarium Check Valves

The check valve permits flow in one direction only, to prevent the flow of water into your CO₂ regulator. Protect your investment with an inline aquarium check valve. It is essential to every CO₂ system setup.

Clippard Check Valve Brass check valve. Permits flow in one direction to protect your CO2 regulator. No CO2 system is complete without it! $13.00

Brass Check Valve High grade brass check valve. Permits flow in one direction to protect your CO2 regulator. Easy view arrow marks direction of flow. No CO2 system is complete without it! $9.99

WaterPlant CO2 Bubble Counter + Check Valve CO2 bubble counter with built in check valve Acrylic material for clear and easy bubble count readings $6.99