An inline check valve that helps keep aquarium water from backing up into a CO₂ regulator or air pump. The push-fit ends take standard 3/16 in aquarium airline or CO₂ tubing.
Fit and connections
Match the part to the CO₂ or dosing setup, or use the plant product as directed on its label.
Point the arrow toward the aquarium and make sure the tubing fits snugly. Check the direction before you switch the pump or CO₂ back on.
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